A Facile Synthesis of 9,10-Dimethoxybenzo[6,7]- ox-epino[3,4-<i>b</i>]quinolin-13(6<i>H</i>)-one and Its Derivatives

A concise and efficient method for the synthesis of novel 9,10-imethoxybenzo[6,7]oxepino[3,4-b]quinolin13(6H)-one and its derivatives 7a-p has been developed via the intramolecular Friedel-Crafts acylation reactions of 6,7-dimethoxy-2-(phenoxymethyl)quinoline-3-carboxylic acids 6a-p with polyphosphoric acid (PPA) as catalyst and solvent under mild conditions. The key intermediates 6a-p were prepared through the in situ formation of ethyl 6,7-dimethoxy-2-(phenoxymethyl)quinoline-3-carboxylates 5a-p followed by hydrolysis with aqueous ethanolic sodium hydroxide solution. The novel synthetic method has the advantages of good yields, easy work-up, and environmentally friendly character, which may provide a novel highly efficient process for making quinoline and related azaheterocycle libraries.

Highly efficient synthesis of 2,3-dihydroquinazolin-4(1H)-ones catalyzed by heteropoly acids in water

Heteropoly acids efficiently catalyzed the cyclocondensation reaction of anthranilamide with aldehydes in water at ambient temperature and afforded the corresponding 2,3-dihydro-4（1H）-quinazolinones compounds in good to excellent yields.This method provides mild reaction conditions and clean reaction profiles,using a small quantity of catalyst and a simple workup procedure.

Synthesis and Crystal Structure of 1-(4-Fluorophenyl)-2-hexylthiobenzo[4,5]-furo[3,2-d]-1,2,4-triazolo[1,5-a]pyrimidin-5(1H)-one

The crystal structure of the title compound 1-（4-fluorophenyl） -2-hexylthio-benzo [4,5]furo[3,2-d]-1,2,4-triazolo[1,5-a]pyrimidin-5（1H） -one（C23H21FN4O2S,Mr = 436.5） has been prepared and determined by single-crystal X-ray diffraction. The crystal is of monoclinic,space group P21/n with a = 13.9854（3） ,b = 17.2678（4） ,c = 18.1828（5）A,β = 99.364（2） °,V = 4332.58（18） A^3,Z = 4,Dc = 1.338,F（000） =1824,μ = 0.185 mm^-1,MoKa radiation（λ = 0.71073） ,R = 0.0538 and wR = 0.1162 for 4728 observed reflections with I 〉 2σ（I） . X-ray diffraction analysis reveals the fused rings of benzo[4,5]furo[3,2-d]-1,2,4-triazolo[1,5-a] pyrimidin-5（1H） -one system are nearly coplanar. The crystal packing is mainly stabilized by weak intermolecular C-H···O hydrogen bond and π-π interactions.

Synthesis of some new bis-3,4-dihydropyrimidin-2(1H)-ones by using silica-supported tin chloride and titanium tetrachloride

Silica-supported tin chloride and titanium tetrachloride were prepared by the reaction of tin chloride and titanium tetrachloride with activated silica gel in refluxing toluene.These solid acids have been employed as the catalysts for the synthesis of bisdihydropyrimidin -2(1H)-ones from aromatic dialdehydes,1,3-dicarbonyl compounds and urea at 90℃under solvent-free conditions.

H_3PMo_(12)O_(40) catalyzed three-component one-pot synthesis of 4,6-diarylpyrimidin-2(1H)-ones under solvent-free conditions

4,6-Diarylpyrimidin-2(1H)-one derivatives have been synthesized from three-component one-pot condensation of acetophe-none derivatives,aldehydes and urea in the presence of trimethylsilyl chloride and a catalytic amount of HPMoOunder solvent-free conditions.

Synthesis and Crystal Structure of a New Quinazolinone Compound 2,3-Dihydro-2-(2-hydroxyphenyl)-3-phenyl-quinazolin-4(1H)-one

A new quinazolinone compound 2,3-dihydro-2-(2-hydroxyphenyl)-3-phenyl- quinazolin-4(1H)-one 3 ([C20H16O2N2]?C2H5OH, Mr = 362.42) and compound 2-(2-hydroxy- benzylidene-amino)-N-phenyl-benzamide 2 (C20H16O2N2, Mr = 316.34) were prepared from a precursor of 2-amino-N-phenyl-benzamide 1 (C13H12ON2, Mr = 212.25). Compound 3 was characterized by single-crystal X-ray diffraction analysis. The crystal belongs to orthorhombic, space group Pbca with a = 1.2889(11), b = 1.6170(14), c = 1.7729(15) nm, V = 3.695(6) nm3, Z = 8, F(000) = 1536, Mr = 362.42, Dc = 1.303 g/cm3, μ(MoKα) = 0.087 mm-1, R = 0.0447 and wR = 0.0879. The crystal structure analysis indicates that the title compound has a two-dimensional network structure formed by hydrogen bonds and electrostatic interactions.

Synthesis and Characterization of a Novel Copoly(aryl ether ketone) Containing 4, 4'-Biphenyl-bis[4-phthalazin-1(2H)-one] Moiety

A new monomer of 4, 4-biphenyl-bis[4-phthalazin-1(2H)-one] was synthesized from biphenyl and phthalic anhydride, and a novel copoly(aryl ether ketone) (PPEK) was synthesized from 2, 2-bis(4-hydroxyphenyl)-propane (BPA), 4, 4'-biphenyl-bis-[4-phthalazin-1(2H)-one], 4, 4- difluorodiphenylketone (DFK). The monomer and copolymer were characterized by FT-IR and 1H-NMR. DSC and TGA were used to the novel polymer.

Synthesis and Crystal Structure of 4-Bromo-5-ethoxy-3-methyl-5- (naphthalen-1-yl)-1-tosyl-1H-pyrrol-2(5H)-one

The title compound 4-bromo-5-ethoxy-3-methyl-5-（naphthalen-l-yl）-l-tosyl-lH- pyrrol-2（5H）-one 1 （C24H22BrNO4S, Mr = 500.40） has been synthesized and its crystal structure was determined by single-crystal X-ray diffraction analysis. It crystallizes in monoclinic, space group P21/n with a = 8.8562（15）, b = 18.118（3）, c = 14.055（2）A, β = 99.855（3）^o, V= 2221.9（6）A3, Z = 4, Dc = 1.496 g/cm^3,μ= 1.975 mm^-1, 2 = 0.71073A, F（000） = 1024, R = 0.0607 and wR = 0.1371.

3H－1，2－二氢－2－（4－甲基苯胺基）甲基－1－吡咯里嗪酮在家兔体内主要代谢产物的研究

用高效液相色谱法对家兔单剂量ｉｇ７５０ｍｇ新抗炎镇痛剂３Ｈ－１，２二氢－２－（４－甲基苯胺基）－甲基－１－吡咯里嗪酮（Ｚ－４７）后尿中的代谢物进行了分离、检测。根据代谢物的色谱行为及与Ｚ－４７结构有关的其它药物的代谢途径，推测Ｚ－４７羧基衍生物［４－（３Ｈ－１，２－二氢－１－吡咯里嗪酮－２－甲基胺基）苯甲酸］是一可能的代谢产物，遂用化学方法合成了该衍生物。利用色谱保留值、紫外双波长吸收比值等对代谢物和标准品进行比较，并对尿样的酶水解产物进行色谱分析，证实Ｚ－４７羧基衍生物及其酯型β－Ｄ－葡糖苷酸结合物是Ｚ－４７在家兔体内的主要代谢产物。

3,4-二氢吡咯[1,2-a]吡嗪-1-酮衍生物的合成及抗炎镇痛作用

目的研究(2H)-2-环己基-3,4-二氢吡咯[1,2-a]吡嗪-1-酮衍生物抗炎镇痛作用的构效关系。方法以2-吡咯甲酸甲酯为原料,经取代、环合,制备(2H)-2-环己基-3,4-二氢吡咯[1,2-a]吡嗪-1-酮(3);通过Friedel-Crafts酰基化反应,制得其6-酰基衍生物4a^4j。用小鼠测试了所合成化合物的抗炎和镇痛活性。结果与结论合成了10个未见文献报道的新化合物4a^4j,其结构经MS1、H-NMR分析确证。抗炎镇痛试验表明,有些化合物具有明显的抗炎和/或镇痛作用,其中化合物4d的活性与对照药布洛芬相当。

Reaction of 2,3-Dihydro-1,5-benzothiazepines and Phenylacetyl Chloride in the Presence of Triethylamine:A New Aspect on the Formation Mechanism of Dihydro-1,3-oxazin-4-one Derivatives

2a,4-Disubstituted 2,2a,3,4-tetrahydro-2-phenyl-1H-azeto[2,1-d][1,5]benzothiazepin-1-ones, as well as 2-substi- tuted 2,3-dihydro-3-phenylacetyl-2-styryl-benzothiazoles and 4a,6-disubstituted 3-benzyl-4a,5-dihydro-2-phenyl- 1H,6H-[1,3]oxazino[2,3-d][1,5]benzothiazepin-1-ones, were obtained from the reaction of 2,4-disubstituted 2,3-dihydro-1,5-benzothiazepines with phenylacetyl chloride in the presence of triethylamine. The mechanism for the formation of 4a,5-dihydro-1H,6H-[1,3]oxazino[2,3-d][1,5]benzothiazepin-1-ones, 2,3-dihydro-1,3-oxazin-4-one derivatives, was suggested.

Synthesis of pyrazine-2,3-dicarbonitrile and 1,2,4-triazine-5(4H)-one derivatives from furan-2,3-diones

The reaction of furan-2,3-diones with S-methylisothiosemicarbazide hydroiodide yielded novel 1,2,4- triazine-5（4H）-ones, and reaction of furan-2,3-diones with diaminomaleonitrile led to the formation of pyrazine-2,3-dicarbonitrile derivatives, and the hydrolysis of these products led to the formation of more new pyrazine-2,3-dicarbonitrile derivatives. These compounds are potential herbicides and pesticides.

Structure-based design and synthesis of 5-benzyl-2-phenylpyrimidin-4(3H)-one derivatives as novel MEK1 inhibitors

Previous studies have shown that Ras/Raf/MEK/ERK signaling pathway is up-regulated in almost all cancer cells.Blocking of this pathway by MEK inhibition is an efficient therapeutic approach of cancer.In the present study,we described the discovery of 5-benzyl-2-phenylpyrimidin-4（3 H）-one as a novel skeleton of allosteric MEK inhibitor.All acquired target compounds exhibited modest potency to inhibit MEK1 in Raf-MEK cascading assay,and docking studies revealed that the binding mode of the most potent compound（SJ3） was very similar to that of the well known diarylamine-based inhibitor（PD0325901）.The results provided valuable guidance for further optimizations on this novel scaffold to achieve druggable molecules.

Design, synthesis, and biological evaluation of quinazolin-4(3H)-one derivatives co-targeting poly (ADP-ribose) polymerase-1 and bromodomain containing protein 4 for breast cancer therapy

This study was aimed to design the first dual-target small-molecule inhibitor co-targeting poly(ADP-ribose)polymerase-1(PARP1)and bromodomain containing protein 4(BRD4),which had important cross relation in the global network of breast cancer,reflecting the synthetic lethal effect.A series of new BRD4 and PARP1 dual-target inhibitors were discovered and synthesized by fragmentbased combinatorial screening and activity assays that together led to the chemical optimization.Among these compounds,19 d was selected and exhibited micromole enzymatic potencies against BRD4 and PARP1,respectively.Compound 19 d was further shown to efficiently modulate the expression of BRD4 and PARP1.Subsequently,compound 19 d was found to induce breast cancer cell apoptosis and stimulate cell cycle arrest at G1 phase.Following pharmacokinetic studies,compound 19 d showed its antitumor activity in breast cancer susceptibility gene 1/2(BRCA1/2)wild-type MDA-MB-468 and MCF-7 xenograft models without apparent toxicity and loss of body weight.These results together demonstrated that a highly potent dual-targeted inhibitor was successfully synthesized and indicated that co-targeting of BRD4 and PARP1 based on the concept of synthetic lethality would be a promising therapeutic strategy for breast cancer.

布朗斯特酸性离子液体[DC2O2IM][p-CH3PhSO3]催化Biginelli三组分反应的研究

本文报道了布朗斯特酸性离子液体1,3-二羧甲基咪唑对甲苯磺酸盐作为一种绿色、环境友好的催化剂,成功地催化Biginelli三组分反应合成了一系列3,4-二氢嘧啶-2(1H)-酮或硫酮化合物。该方法具有条件温和、产率高、反应时间短的优点。此外,催化剂离子液体可循环使用五次且催化活性没有明显降低。

Sulfamic acid as a reusable and green catalyst for efficient and simple synthesis of 2-substituted-2,3-dihydroquinazolin-4(1H)-ones in water or methanol

A series of 2,3-dihydroquinazolin-4（1H）-ones have been synthesized in good to excellent yields through direct cyclocondensation of anthranilamide and aryl aldehydes or ketones in water or methanol under mild conditions.The reaction was efficiently promoted by 10 mol%sulfamic acid（SA,H_2NSO_3H） and the catalyst could be recovered easily after the reactions and reused without evident loss of reactivity.

Melamine trisulfonic acid:A new,efficient and recyclable catalyst for the synthesis of 3,4-dihydropyrimidin-2(1H)-ones/thiones in the absence of solvent

Melamine trisulfonic acid（MTSA） can be used as an efficient and recyclable catalyst for the promotion of the synthesis of 3,4- dihydropyrimidin-2（1H）-ones/thiones（DHPMs） in the absence of solvent.All reactions were performed at 80℃in good to high yields.

Synthesis of 2,3-dihydroquinazolin-4(1H)-ones catalyzed by zirconium(Ⅳ) chloride as a mild and efficient catalyst

2,3-Dihydroquinazolin-4（1H）-ones have been synthesized in the high to excellent yields via condensation of 2-aminobenzamide with aldehydes and ketones in the presence of catalytic amount of ZrCl_4 in EtOH at room temperature.Mild reaction conditions, clean reaction media,simple workup and easy purification are advantages of this methodology.

Strontium chloride-catalyzed one-pot synthesis of 2,3-dihydroquinazolin-4(1H)-ones in protic media

A wide range of mono-and disubstituted 2,3-dihydroquinazolin-4（1H）-ones were obtained in high yields by condensation of isatoic anhydride,aldehydes with ammonium salts or primary amines in the presence of strontium chloride in aqueous ethanol under reflux.