The crystal structure of the new title compound 2-ethoxy-3-n-butyl- benzofuro[2,3d]pyrimidin-4(3H)-one (C16H18N2O3, Mr = 286.32) has been prepared and determined by singlecrystal X-ray diffraction. The crystal is ...The crystal structure of the new title compound 2-ethoxy-3-n-butyl- benzofuro[2,3d]pyrimidin-4(3H)-one (C16H18N2O3, Mr = 286.32) has been prepared and determined by singlecrystal X-ray diffraction. The crystal is of monoclinic, space group P21/c with a = 13.7167(14), b = 13.113(1), c = 8.378(1) A, β = 98.992(2)^o, V = 1488.4(3) A^3, Z = 4, Dc = 1.278, F(000) = 608, μ = 0.089 mm^-1, MoKa radiation (2 = 0.71073), R = 0.0498, wR = 0.1238 for 2336 observed reflections with I 〉 2σ(I). X-ray diffraction analysis reveals that all ring atoms in the benzo[4, 5]furo [2,3-d] pyrimi- dinone moieties are almost coplanar.展开更多
A neoteric organic-inorganic hybrid Co-substituted phosphotungstate H6{[Co(en)2(OAc)2]2[Co4(H2 O)2(PW9 O34)2]}·2 H2 en·36 H2 O(1, en = enthylenediamine) has been made under hydrothermal conditions and charac...A neoteric organic-inorganic hybrid Co-substituted phosphotungstate H6{[Co(en)2(OAc)2]2[Co4(H2 O)2(PW9 O34)2]}·2 H2 en·36 H2 O(1, en = enthylenediamine) has been made under hydrothermal conditions and characterized by IR spectrum, thermogravimetric analysis, diffuse-reflectance spectroscopy, powder X-ray diffraction, single-crystal X-ray diffraction and cyclic voltammetry, respectively. Crystal data for 1: monoclinic, P21/c, a = 18.2234(12), b = 15.3696(9), c = 20.1706(17) A, β = 106.563(8)°, V = 5415.1(7) A3, Z = 2, Mr = 6072.30, Dc = 3.724 g/cm3, μ = 20.087 mm-1, F(000) = 5540, R = 0.0585, w R = 0.1543 and S = 1.024. Single-crystal X-ray structure analysis reveals that compound 1 exhibits a 3-D supramolecular framework via H-bonding interactions, in which the discrete Co-complex is modified by two types of organic ligands, en and acetate. In addition, the adsorption experiments demonstrate compound 1 possesses a remarkable capability for scavenging of methylene blue.展开更多
A facile one-pot synthesis of new 3-arylthieno[2,3-d]pyrimidine-2,4(1H,3H)-diones via base-catalyzed cyclocondensation of ethyl 2-amino-4,5-dimethylthiophene-3-carboxylate with aryl isocyanates is described.
Novel heteropolycyclic nitrogen systems bearing fluorine substituted pyrazolo[3,4-d] pyrimidine moiety have been synthesis by the interaction between N’-heteroaryl guanidine 4 with polyfunctional π-acceptors in diff...Novel heteropolycyclic nitrogen systems bearing fluorine substituted pyrazolo[3,4-d] pyrimidine moiety have been synthesis by the interaction between N’-heteroaryl guanidine 4 with polyfunctional π-acceptors in different media and condition. The structures of the synthesis compounds were established by spectroscopic analysis and evaluated as antifungal probes in various concentration.展开更多
The crystal structure of the title compound ethyl 3-(4-chlorophenyl)-3,4-dihydro-6- methyl-4-oxo-2-(pyrrolidin-1-yl)furo[2,3-d]pyrimidine-5-carboxylate (C20H20ClN3O4, Mr= 401.84) has been prepared and determined...The crystal structure of the title compound ethyl 3-(4-chlorophenyl)-3,4-dihydro-6- methyl-4-oxo-2-(pyrrolidin-1-yl)furo[2,3-d]pyrimidine-5-carboxylate (C20H20ClN3O4, Mr= 401.84) has been prepared and determined by single-crystal X-ray diffraction. The crystal is of monoclinic, space group P21/n with a = 20.6215(9), b = 8.5311(4), c = 21.6886(9) A^°, β = 91.607(1)°, V = 3814.0(3)A^°^3, Z = 8, Dc = 1.400 g/cm^3, F(000) = 1680, μ = 0.233 mm^-1, R = 0.0718 and wR = 0.1545 for 6717 observed reflections with I 〉 2σ(I). X-ray diffraction analysis reveals two crystallographically independent molecules in the asymmetric unit.展开更多
The title compounds, 2-(3,3'-bithiophen-2,2'-yl)dibenzothiazole (BTDB) and 2-(dithieno[2,3-b:3',2'-d]thiophen-2,5-yl)dibenzothiazole (DTTDB), have been synthesized and characterized by FT-IR, NMR, MS, HRM...The title compounds, 2-(3,3'-bithiophen-2,2'-yl)dibenzothiazole (BTDB) and 2-(dithieno[2,3-b:3',2'-d]thiophen-2,5-yl)dibenzothiazole (DTTDB), have been synthesized and characterized by FT-IR, NMR, MS, HRMS and X-ray single-crystal diffraction. The crystal of BTDB crystallizes in triclinic, space group P1 with a = 9.2207(17), b = 10.453(2), c = 10.969(2) A, V= 981.2(3) A3 and Z = 2. Crystal data of DTTDB: orthorhombic system, space group Pbcn with a = 4.5290(8), b = 13.576(3), c = 32.033(6) A, V= 1969.6(6) A3 and Z = 4.展开更多
A novel organic-inorganic hybrid compound constructed from mixed ligands, Co3(SIP)2(bipy)4(H2O)6·6.5H2O (H3SIP = 5-sulfoisophthalic acid, bipy = 4,4′-bipyridyl), has been hydrothermally synthesized and c...A novel organic-inorganic hybrid compound constructed from mixed ligands, Co3(SIP)2(bipy)4(H2O)6·6.5H2O (H3SIP = 5-sulfoisophthalic acid, bipy = 4,4′-bipyridyl), has been hydrothermally synthesized and characterized by IR, TGA and single-crystal X-ray diffraction. The crystal belongs to orthorhombic, space group P212121 with a = 11.395(2), b = 19.395(4), c = 30.675(6) A^°, Mr = 1513.05, V= 6779(2) A^°^3, Dc= 1.482 g/cm^3, F(000) = 3120, μ = 0.873 mm^-1, Z= 4, the final R = 0.0439 and wR = 0.119 for 13421 observed reflections with I〉 2σ(I). The structure of the compound presents a 3-D framework containing Co-bipy 1-D chain and 2-D bilayer motifs and carboxylate spacers, and the connection of 1-D chain and 2-D bilayer motifs by carboxylate ligand results in the final open framework with twofold interpenetration net. A probe reaction of the oxidation of benzaldehyde with H2O2 using the title compound as catalyst was carded out in a liquid-solid system, showing that the compound has high oxidative catalytic activity to the reaction.展开更多
The title compound 7-amino-2,3,4,5-tetrahydro-1,3-dimethyl-5-(2-nitrophenyl)- 2,4- dioxo-1H-pyrano[2,3-d] pyrirnidine-6-carbonitrile DMF solvate 1 (C19H20N6O6, Mr = 428.41) was synthesized and crystallized. The cr...The title compound 7-amino-2,3,4,5-tetrahydro-1,3-dimethyl-5-(2-nitrophenyl)- 2,4- dioxo-1H-pyrano[2,3-d] pyrirnidine-6-carbonitrile DMF solvate 1 (C19H20N6O6, Mr = 428.41) was synthesized and crystallized. The crystal belongs to the monoclinic system, space group P2 1/c with a = 11.383(2), b = 13.372(2), c = 13.673(2)A, β = 97.380(4)°, Z = 4, V = 2063.8(6)A^3, Dc = 1.379 g/cm^3,μ(MoKα) = 0.105 mm^-1, F(000) = 896, the final R = 0.0738 and wR = 0.1647 for 2964 observed reflections (I〉 2σ(I)). X-ray analysis reveals that the new pyran ring is coplanar, which is obviously different from those of other similar compounds. In addition, the unclassical hydrogen bonds of C-H…O and C-H…N are presented in the crystals except for the normal hydrogen bonds of N-H…O.展开更多
2, 7-Diaminothieno[2, 3-d:5, 4-d]dipyrimidine-4, 5(3H, 6H)diones 4 were synthesized by a facile synthetic method, which includes bis-aza-Wittig reaction of bis-iminophosphorane 1 with aromatic isocyanate to give bi...2, 7-Diaminothieno[2, 3-d:5, 4-d]dipyrimidine-4, 5(3H, 6H)diones 4 were synthesized by a facile synthetic method, which includes bis-aza-Wittig reaction of bis-iminophosphorane 1 with aromatic isocyanate to give bis-carbodiimide 2 and subsequent reaction of 2 with various dialkylamine in the presence of solid K2CO3 or EtONa.展开更多
The title compound 2-benzylamino-6-methyl-3-cyano-8-phenyl-5H-bispyrazolo[3,4-d,3',2'-b]pyrimidine crystallizes in orthorhombic, space group Pbca with a = 17.945(7), b =10.862(4), c = 19.481(7) A°, β = 9...The title compound 2-benzylamino-6-methyl-3-cyano-8-phenyl-5H-bispyrazolo[3,4-d,3',2'-b]pyrimidine crystallizes in orthorhombic, space group Pbca with a = 17.945(7), b =10.862(4), c = 19.481(7) A°, β = 90°, Z = 8, V = 1151.8(4) A°^3, Mr = 379.43, Dx = 1.327 g/cm^3,μ(MoKa) = 0.084 mm^-1, F(000) = 1584, the final R = 0.0513 and wR = 0.1128 for 2608 observed reflections (I 〉 2σ(I)). X-ray analysis reveals that the tricyclic portion of the molecule is effectively planar. In addition, there exist three intermolecular hydrogen bonds.展开更多
The title compound 2-(2-chloro-4-nitrophenyl)-4-(4-chlorophenyl)-3a,4- diethoxy- 2,3,3a, 4-tetrahydrochromeno[3,4-d][1,2,3]diazaphosphole 2 (C29H30Cl2N3O7P, Mr = 633.44) was synthesized and its structure was cha...The title compound 2-(2-chloro-4-nitrophenyl)-4-(4-chlorophenyl)-3a,4- diethoxy- 2,3,3a, 4-tetrahydrochromeno[3,4-d][1,2,3]diazaphosphole 2 (C29H30Cl2N3O7P, Mr = 633.44) was synthesized and its structure was characterized by IR, MS, ^1H NMR, ^13C NMR, ^31p NMR, elemental analysis and single-crystal X-ray diffraction. It crystallizes in triclinic, space group P1^-, a = 9.1549(3), b = 10.7168(4), c = 17.6272(6)A, α = 102.9363(12), β = 90.2713(9), γ = 117.4265(10)°, V= 1484.41(9)A^3, Z= 2,μ(MoKa) = 0.323, F(000) = 658, Z= 2, De= 1.417 g/cm^3, the final R = 0.0687 and wR = 0.2066 for 4943 observed reflections (I 〉 2σ(I)). X-ray analysis reveals that the diazaphospholine ring is almost planar and the two ethoxy groups bonded on the 3a- and 4-positions are in trans configurations. Its antiproliferative activity was also tested in vitro against four human tumor cell lines.展开更多
The crystal structure of the new title compound 3-(4-chlorophenyl)-8-cyano-2-(di-iso-propylamino)-5-methyl-7-(methylthio)-pyrido[4,3-d]pyrimidine-4(3H)-one(C22H24ClN5OS,Mr = 441.97)has been determined by sin...The crystal structure of the new title compound 3-(4-chlorophenyl)-8-cyano-2-(di-iso-propylamino)-5-methyl-7-(methylthio)-pyrido[4,3-d]pyrimidine-4(3H)-one(C22H24ClN5OS,Mr = 441.97)has been determined by single-crystal X-ray diffraction. The crystal is of orthorhombic,space group Pna21 with a = 7.6721(5),b = 18.9370(11),c = 15.6260(9)A,V = 2270.2(2)A^3,Z = 4,Dc = 1.293 g/cm^3,F(000)= 928,μ = 0.283 mm^-1,MoKa radiation(λ = 0.71073 A),R = 0.0494 and wR = 0.1062 for 3278 observed reflections with I 〉 2σ(I). X-ray diffraction analysis reveals that all ring atoms in the py-ridopyrimidinone moiety are almost coplanar. Intramolecular C(20)-H(20)···N(4),C(19)-H(19A)···N(3),C(18)-H(18C)···N(3)and C(16)-H(16B)···O(5)hydrogen bonds together with weak C···π interactions are found in the structure.展开更多
A series of pyrido[2,3-d]pyrimidines derivatives have been prepared by one-pot three-component reaction of 4(6)-aminouracil, malononitrile and aromatic aldehydes. This efficient synthesis was done under microwave irra...A series of pyrido[2,3-d]pyrimidines derivatives have been prepared by one-pot three-component reaction of 4(6)-aminouracil, malononitrile and aromatic aldehydes. This efficient synthesis was done under microwave irradiation conditions (method A) and also using catalytic amount of diammonium hydrogen phosphate [(NH4)2HPO4] (DAHP) in aqueous media (method B). This procedure has the advantages of good yields, easy work-up, and benign environmentally friendly character. Reaction could proceed via domino Knoevenagel-Michael-cyclization reactions.展开更多
We report for the first time the theoretical analysis and experimental results of a white-light reconstructed monochromatic 3-D image synthesizing tomograms by multiple rainbow holo-graphy with vertical-area partition...We report for the first time the theoretical analysis and experimental results of a white-light reconstructed monochromatic 3-D image synthesizing tomograms by multiple rainbow holo-graphy with vertical-area partition (VAP) approach. The theoretical and experimental results show that 3-D monochromatic image can be synthesized by recording the master hologram by VAP ap-proach without any distortions either in gray scale or in geometrical position. A 3-D monochromatic image synthesized from a series of medical tomograms is presented in this paper for the first time.展开更多
Agreen regioselective synthesis of some new and known 9-aryl-5,9-dihydropyrimido[4,5-d][l,2,4]triazolo[1,5-a]pyrimidine-6,8(4H,7H)-diones has been described via the microwave-assisted one-pot reaction of 3-amino-1H-...Agreen regioselective synthesis of some new and known 9-aryl-5,9-dihydropyrimido[4,5-d][l,2,4]triazolo[1,5-a]pyrimidine-6,8(4H,7H)-diones has been described via the microwave-assisted one-pot reaction of 3-amino-1H-1,2,4-triazoles,aromatic aldehydes and barbituric acids under solvent- and catalyst-free conditions.This operationally simple procedure is less laborious and provides a better scope than previously reported procedures.展开更多
基金This work was supported by the Natural Science Foundation of Hubei Province (2006ABB016)National Natural Science Foundation of China (20672041) Key Project of Science and Technology of Ministry of Education of China (107082, 106116)
文摘The crystal structure of the new title compound 2-ethoxy-3-n-butyl- benzofuro[2,3d]pyrimidin-4(3H)-one (C16H18N2O3, Mr = 286.32) has been prepared and determined by singlecrystal X-ray diffraction. The crystal is of monoclinic, space group P21/c with a = 13.7167(14), b = 13.113(1), c = 8.378(1) A, β = 98.992(2)^o, V = 1488.4(3) A^3, Z = 4, Dc = 1.278, F(000) = 608, μ = 0.089 mm^-1, MoKa radiation (2 = 0.71073), R = 0.0498, wR = 0.1238 for 2336 observed reflections with I 〉 2σ(I). X-ray diffraction analysis reveals that all ring atoms in the benzo[4, 5]furo [2,3-d] pyrimi- dinone moieties are almost coplanar.
基金supported by the NSFC(Nos.21571016,21831001 and 91122028)the NSFC for Distinguished Young Scholars(No.20725101)
文摘A neoteric organic-inorganic hybrid Co-substituted phosphotungstate H6{[Co(en)2(OAc)2]2[Co4(H2 O)2(PW9 O34)2]}·2 H2 en·36 H2 O(1, en = enthylenediamine) has been made under hydrothermal conditions and characterized by IR spectrum, thermogravimetric analysis, diffuse-reflectance spectroscopy, powder X-ray diffraction, single-crystal X-ray diffraction and cyclic voltammetry, respectively. Crystal data for 1: monoclinic, P21/c, a = 18.2234(12), b = 15.3696(9), c = 20.1706(17) A, β = 106.563(8)°, V = 5415.1(7) A3, Z = 2, Mr = 6072.30, Dc = 3.724 g/cm3, μ = 20.087 mm-1, F(000) = 5540, R = 0.0585, w R = 0.1543 and S = 1.024. Single-crystal X-ray structure analysis reveals that compound 1 exhibits a 3-D supramolecular framework via H-bonding interactions, in which the discrete Co-complex is modified by two types of organic ligands, en and acetate. In addition, the adsorption experiments demonstrate compound 1 possesses a remarkable capability for scavenging of methylene blue.
基金We gratefully acknowledge financial support of this work by the National Key Project for Basic Research(2003CB114400,2003CB114406)the National Natural Science Foundation of China(Project No.20102001).
文摘A facile one-pot synthesis of new 3-arylthieno[2,3-d]pyrimidine-2,4(1H,3H)-diones via base-catalyzed cyclocondensation of ethyl 2-amino-4,5-dimethylthiophene-3-carboxylate with aryl isocyanates is described.
文摘Novel heteropolycyclic nitrogen systems bearing fluorine substituted pyrazolo[3,4-d] pyrimidine moiety have been synthesis by the interaction between N’-heteroaryl guanidine 4 with polyfunctional π-acceptors in different media and condition. The structures of the synthesis compounds were established by spectroscopic analysis and evaluated as antifungal probes in various concentration.
基金supported by the Natural Science Foundation of Hubei Province (2006ABB016)Key Science Research Project of Hubei Provincial Department of Education (No.D200724001) the Science Research Project of Yunyang Medical College (No. 2006QDJ16)
文摘The crystal structure of the title compound ethyl 3-(4-chlorophenyl)-3,4-dihydro-6- methyl-4-oxo-2-(pyrrolidin-1-yl)furo[2,3-d]pyrimidine-5-carboxylate (C20H20ClN3O4, Mr= 401.84) has been prepared and determined by single-crystal X-ray diffraction. The crystal is of monoclinic, space group P21/n with a = 20.6215(9), b = 8.5311(4), c = 21.6886(9) A^°, β = 91.607(1)°, V = 3814.0(3)A^°^3, Z = 8, Dc = 1.400 g/cm^3, F(000) = 1680, μ = 0.233 mm^-1, R = 0.0718 and wR = 0.1545 for 6717 observed reflections with I 〉 2σ(I). X-ray diffraction analysis reveals two crystallographically independent molecules in the asymmetric unit.
基金supported by the National Natural Science Foundation of China (20972041)Program for Innovation Scientists and Technicians Troop Construction Projects of Henan Province (104100510011)the Program of Henan University (SBGJ090506)
文摘The title compounds, 2-(3,3'-bithiophen-2,2'-yl)dibenzothiazole (BTDB) and 2-(dithieno[2,3-b:3',2'-d]thiophen-2,5-yl)dibenzothiazole (DTTDB), have been synthesized and characterized by FT-IR, NMR, MS, HRMS and X-ray single-crystal diffraction. The crystal of BTDB crystallizes in triclinic, space group P1 with a = 9.2207(17), b = 10.453(2), c = 10.969(2) A, V= 981.2(3) A3 and Z = 2. Crystal data of DTTDB: orthorhombic system, space group Pbcn with a = 4.5290(8), b = 13.576(3), c = 32.033(6) A, V= 1969.6(6) A3 and Z = 4.
基金Supported by the Natural Science Foundation of Fujian Province (2008 J0172)Innovate Project of Fujian Province (2007F3107)National Natural Science Foundation of China (20705031)
文摘A novel organic-inorganic hybrid compound constructed from mixed ligands, Co3(SIP)2(bipy)4(H2O)6·6.5H2O (H3SIP = 5-sulfoisophthalic acid, bipy = 4,4′-bipyridyl), has been hydrothermally synthesized and characterized by IR, TGA and single-crystal X-ray diffraction. The crystal belongs to orthorhombic, space group P212121 with a = 11.395(2), b = 19.395(4), c = 30.675(6) A^°, Mr = 1513.05, V= 6779(2) A^°^3, Dc= 1.482 g/cm^3, F(000) = 3120, μ = 0.873 mm^-1, Z= 4, the final R = 0.0439 and wR = 0.119 for 13421 observed reflections with I〉 2σ(I). The structure of the compound presents a 3-D framework containing Co-bipy 1-D chain and 2-D bilayer motifs and carboxylate spacers, and the connection of 1-D chain and 2-D bilayer motifs by carboxylate ligand results in the final open framework with twofold interpenetration net. A probe reaction of the oxidation of benzaldehyde with H2O2 using the title compound as catalyst was carded out in a liquid-solid system, showing that the compound has high oxidative catalytic activity to the reaction.
基金the Foundation of the Youth (OH060099) of China University of Mining and Technologythe Foundation of Natural Science Foundation (06AXL010) of Xuzhou Normal UniversityNatural Science Foundation (04KJB150139) of Education Committee of Jiangsu Province
文摘The title compound 7-amino-2,3,4,5-tetrahydro-1,3-dimethyl-5-(2-nitrophenyl)- 2,4- dioxo-1H-pyrano[2,3-d] pyrirnidine-6-carbonitrile DMF solvate 1 (C19H20N6O6, Mr = 428.41) was synthesized and crystallized. The crystal belongs to the monoclinic system, space group P2 1/c with a = 11.383(2), b = 13.372(2), c = 13.673(2)A, β = 97.380(4)°, Z = 4, V = 2063.8(6)A^3, Dc = 1.379 g/cm^3,μ(MoKα) = 0.105 mm^-1, F(000) = 896, the final R = 0.0738 and wR = 0.1647 for 2964 observed reflections (I〉 2σ(I)). X-ray analysis reveals that the new pyran ring is coplanar, which is obviously different from those of other similar compounds. In addition, the unclassical hydrogen bonds of C-H…O and C-H…N are presented in the crystals except for the normal hydrogen bonds of N-H…O.
基金We gratefully acknowledge financial support of this work by the National Key Project for Basic Research(2003CB114400,2003CB114406)the National Natural Science Foundation of China(Project No.20372023 and 20102001).
文摘2, 7-Diaminothieno[2, 3-d:5, 4-d]dipyrimidine-4, 5(3H, 6H)diones 4 were synthesized by a facile synthetic method, which includes bis-aza-Wittig reaction of bis-iminophosphorane 1 with aromatic isocyanate to give bis-carbodiimide 2 and subsequent reaction of 2 with various dialkylamine in the presence of solid K2CO3 or EtONa.
文摘The title compound 2-benzylamino-6-methyl-3-cyano-8-phenyl-5H-bispyrazolo[3,4-d,3',2'-b]pyrimidine crystallizes in orthorhombic, space group Pbca with a = 17.945(7), b =10.862(4), c = 19.481(7) A°, β = 90°, Z = 8, V = 1151.8(4) A°^3, Mr = 379.43, Dx = 1.327 g/cm^3,μ(MoKa) = 0.084 mm^-1, F(000) = 1584, the final R = 0.0513 and wR = 0.1128 for 2608 observed reflections (I 〉 2σ(I)). X-ray analysis reveals that the tricyclic portion of the molecule is effectively planar. In addition, there exist three intermolecular hydrogen bonds.
文摘The title compound 2-(2-chloro-4-nitrophenyl)-4-(4-chlorophenyl)-3a,4- diethoxy- 2,3,3a, 4-tetrahydrochromeno[3,4-d][1,2,3]diazaphosphole 2 (C29H30Cl2N3O7P, Mr = 633.44) was synthesized and its structure was characterized by IR, MS, ^1H NMR, ^13C NMR, ^31p NMR, elemental analysis and single-crystal X-ray diffraction. It crystallizes in triclinic, space group P1^-, a = 9.1549(3), b = 10.7168(4), c = 17.6272(6)A, α = 102.9363(12), β = 90.2713(9), γ = 117.4265(10)°, V= 1484.41(9)A^3, Z= 2,μ(MoKa) = 0.323, F(000) = 658, Z= 2, De= 1.417 g/cm^3, the final R = 0.0687 and wR = 0.2066 for 4943 observed reflections (I 〉 2σ(I)). X-ray analysis reveals that the diazaphospholine ring is almost planar and the two ethoxy groups bonded on the 3a- and 4-positions are in trans configurations. Its antiproliferative activity was also tested in vitro against four human tumor cell lines.
基金supported by the National Key Project for Basic Research (2010CB126100)National Natural Science Foundation of China (20772042)Syngenta Ltd in UK and supported in part by the PCSIRT (No.IRT0953)
文摘The crystal structure of the new title compound 3-(4-chlorophenyl)-8-cyano-2-(di-iso-propylamino)-5-methyl-7-(methylthio)-pyrido[4,3-d]pyrimidine-4(3H)-one(C22H24ClN5OS,Mr = 441.97)has been determined by single-crystal X-ray diffraction. The crystal is of orthorhombic,space group Pna21 with a = 7.6721(5),b = 18.9370(11),c = 15.6260(9)A,V = 2270.2(2)A^3,Z = 4,Dc = 1.293 g/cm^3,F(000)= 928,μ = 0.283 mm^-1,MoKa radiation(λ = 0.71073 A),R = 0.0494 and wR = 0.1062 for 3278 observed reflections with I 〉 2σ(I). X-ray diffraction analysis reveals that all ring atoms in the py-ridopyrimidinone moiety are almost coplanar. Intramolecular C(20)-H(20)···N(4),C(19)-H(19A)···N(3),C(18)-H(18C)···N(3)and C(16)-H(16B)···O(5)hydrogen bonds together with weak C···π interactions are found in the structure.
文摘A series of pyrido[2,3-d]pyrimidines derivatives have been prepared by one-pot three-component reaction of 4(6)-aminouracil, malononitrile and aromatic aldehydes. This efficient synthesis was done under microwave irradiation conditions (method A) and also using catalytic amount of diammonium hydrogen phosphate [(NH4)2HPO4] (DAHP) in aqueous media (method B). This procedure has the advantages of good yields, easy work-up, and benign environmentally friendly character. Reaction could proceed via domino Knoevenagel-Michael-cyclization reactions.
基金This work was supported by the National Natural Science Foundation of China (Grant No. 69677020) and the Tianjin Foundation of Natural Science for this research.
文摘We report for the first time the theoretical analysis and experimental results of a white-light reconstructed monochromatic 3-D image synthesizing tomograms by multiple rainbow holo-graphy with vertical-area partition (VAP) approach. The theoretical and experimental results show that 3-D monochromatic image can be synthesized by recording the master hologram by VAP ap-proach without any distortions either in gray scale or in geometrical position. A 3-D monochromatic image synthesized from a series of medical tomograms is presented in this paper for the first time.
文摘Agreen regioselective synthesis of some new and known 9-aryl-5,9-dihydropyrimido[4,5-d][l,2,4]triazolo[1,5-a]pyrimidine-6,8(4H,7H)-diones has been described via the microwave-assisted one-pot reaction of 3-amino-1H-1,2,4-triazoles,aromatic aldehydes and barbituric acids under solvent- and catalyst-free conditions.This operationally simple procedure is less laborious and provides a better scope than previously reported procedures.