A series of novel furan/thiophene and piperazine-containing 1,2,4-triazole Mannich bases and bis(1,2,4-triazole) Mannich bases have been conveniently synthesized via Mannich reaction with triazole Schiff bases, vari...A series of novel furan/thiophene and piperazine-containing 1,2,4-triazole Mannich bases and bis(1,2,4-triazole) Mannich bases have been conveniently synthesized via Mannich reaction with triazole Schiff bases, various pipera- zinc derivatives, and formaldehyde as intermediates in good yields. Their structures were characterized by melting points, ~H NMR, 13C NMR, IR and elemental analysis. The preliminary bioassay showed that most compounds ex- hibited significant in vitro and in vivo fungicidal activity against several test plant fungi. Among 32 new compounds, the trifluoromethyl-containing compounds showed superior activity than the methyl-containing ones. Several com- pounds, such as FS, F9, F10, G5, HT, 118, 13 and 14, were comparable with some commercial fungicides against different fungi during the present study and could be further structurally optimized. Meanwhile, several compounds showed good herbicidal activity against Brassica campestris at 100 ~tg/mL and KARl inhibitory activity at 200 μg/mL. However, compounds exhibited poor insecticidal activity against oriental armyworm at 200 μg/mL in the preliminary studies. The research results will provide useful information for the design and discovery of new agro- chemicals with novel heterocyclic structures.展开更多
Two new Mannich and Schiff base ligands namely: (1-(3'-amino-methyl-1'(H)-1',2',4'-triazole)-3-(1'(H)-l',2',4'- triazole-3'-yl) iminoisatin (Lt) and l-morpholinomethyl-3-(1'(H)-1',2',4'-tr...Two new Mannich and Schiff base ligands namely: (1-(3'-amino-methyl-1'(H)-1',2',4'-triazole)-3-(1'(H)-l',2',4'- triazole-3'-yl) iminoisatin (Lt) and l-morpholinomethyl-3-(1'(H)-1',2',4'-triazolyl)iminoisatin (LII) were prepared from condensation reaction of the new Schiff base 3-(l'(H)-l',2',4'-triazole-3'-yl)iminoisatin (SBH) (0.01 mol) with formaldehyde and 3-amino-l,2,4-triazole (3-At) or with formaldehyde and morpholine (0.01 mole each) respectively. Structures were characterized by tH NMR, CHN analyses, mass spectra and IR spectra. Metal complexes were synthesized by heating each ligand (0.02 mo with metal salts (0.01 moo in ethanol or ethanol: acetone mixture respectively. The formula of metal complexes were suggested depending on CHN and thermal analyses, metal and chloride contents, IR and UV-visible spectra, magnetic moments (laefr) and conductivity measurements. All complexes were of octahedral geometry except palladium (II) complexes which were square planar. The two ligands and some selected metal complexes showed various antibacterial and cytotoxic effects.展开更多
The target compound 1,2,4-triazole Schiff base containing pyrazole ring was synthesized by 4-amino-2,4-dihydro-5-((3,5-dimethyl- lH-pyrazol-1-yl)methyl)-3H-1,2,4-triazole-3-thione and 3,4,5-trimethoxy benzaldehyde...The target compound 1,2,4-triazole Schiff base containing pyrazole ring was synthesized by 4-amino-2,4-dihydro-5-((3,5-dimethyl- lH-pyrazol-1-yl)methyl)-3H-1,2,4-triazole-3-thione and 3,4,5-trimethoxy benzaldehyde.The structure was confirmed by IR,~1H NMR,H RMS,elemental analysis and single-crystal X-ray diffraction.The crystal belongs to the triclinic system,space group P1 with a = 7.8772(17),b = 8.2986(18),c = 15.392(3) A,α= 93.360(4),β= 94.609(4),γ= 93.584(4)°,C(18)H(22)N6O3S,Mr= 402.47,V= 998.9(4) A^3,Z= 2,F(000) = 422,Dc =1.335 g/cm^3,μ= 0.194 mm^(-1),the final R = 0.0533 and wR = 0.1329 for 3517 observed reflections with I 2σ(I).The preliminary bioassay results indicate that the target compound has good fungicidal activity against Gibberlla nicotiancola in EC50 value and F.O.f.sp.niveum in EC(95) value.展开更多
A Schiff base was synthesized by 3-methyl-4-amino-5-ethoxycarbonyl-methylsul- fanyl-1,2,4-triazole with 3-nitrobenzaldehyde. The structure was confirmed by IH NMR, IR, H RMS, TGA techniques and X-ray diffraction. The ...A Schiff base was synthesized by 3-methyl-4-amino-5-ethoxycarbonyl-methylsul- fanyl-1,2,4-triazole with 3-nitrobenzaldehyde. The structure was confirmed by IH NMR, IR, H RMS, TGA techniques and X-ray diffraction. The crystal belongs to monoclinic system, space group P21/c, with a = 8.965(2), b = 21.903(5), c = 9.197(2) ,A, β = 114.011(4)°, CIaH15NsOnS, Mr = 349.08, V= 1649.7(6) A3, De = 1.407 g·cm-3, Z = 4, F(000) = 728,μ =0.226 mm1, the final R = 0.0574 and wR = 0.1336 for 2932 unique reflections with 1 〉 2σ(I). Furthermore, the biological activity to four vegetable pathogens has been tested. The title compound exhibits better biological activity to four vegetable pathogens compared to the Schiff base without 5-ethoxycarbonyl and to Gibberlla saubinetti in EC95 compared with triadimefon.展开更多
文摘A series of novel furan/thiophene and piperazine-containing 1,2,4-triazole Mannich bases and bis(1,2,4-triazole) Mannich bases have been conveniently synthesized via Mannich reaction with triazole Schiff bases, various pipera- zinc derivatives, and formaldehyde as intermediates in good yields. Their structures were characterized by melting points, ~H NMR, 13C NMR, IR and elemental analysis. The preliminary bioassay showed that most compounds ex- hibited significant in vitro and in vivo fungicidal activity against several test plant fungi. Among 32 new compounds, the trifluoromethyl-containing compounds showed superior activity than the methyl-containing ones. Several com- pounds, such as FS, F9, F10, G5, HT, 118, 13 and 14, were comparable with some commercial fungicides against different fungi during the present study and could be further structurally optimized. Meanwhile, several compounds showed good herbicidal activity against Brassica campestris at 100 ~tg/mL and KARl inhibitory activity at 200 μg/mL. However, compounds exhibited poor insecticidal activity against oriental armyworm at 200 μg/mL in the preliminary studies. The research results will provide useful information for the design and discovery of new agro- chemicals with novel heterocyclic structures.
文摘Two new Mannich and Schiff base ligands namely: (1-(3'-amino-methyl-1'(H)-1',2',4'-triazole)-3-(1'(H)-l',2',4'- triazole-3'-yl) iminoisatin (Lt) and l-morpholinomethyl-3-(1'(H)-1',2',4'-triazolyl)iminoisatin (LII) were prepared from condensation reaction of the new Schiff base 3-(l'(H)-l',2',4'-triazole-3'-yl)iminoisatin (SBH) (0.01 mol) with formaldehyde and 3-amino-l,2,4-triazole (3-At) or with formaldehyde and morpholine (0.01 mole each) respectively. Structures were characterized by tH NMR, CHN analyses, mass spectra and IR spectra. Metal complexes were synthesized by heating each ligand (0.02 mo with metal salts (0.01 moo in ethanol or ethanol: acetone mixture respectively. The formula of metal complexes were suggested depending on CHN and thermal analyses, metal and chloride contents, IR and UV-visible spectra, magnetic moments (laefr) and conductivity measurements. All complexes were of octahedral geometry except palladium (II) complexes which were square planar. The two ligands and some selected metal complexes showed various antibacterial and cytotoxic effects.
基金supported by the National Natural Science Foundation of China(No.21373161)the Scientific and Technological Projects of Shaanxi Province(No.2013K02-25)
文摘The target compound 1,2,4-triazole Schiff base containing pyrazole ring was synthesized by 4-amino-2,4-dihydro-5-((3,5-dimethyl- lH-pyrazol-1-yl)methyl)-3H-1,2,4-triazole-3-thione and 3,4,5-trimethoxy benzaldehyde.The structure was confirmed by IR,~1H NMR,H RMS,elemental analysis and single-crystal X-ray diffraction.The crystal belongs to the triclinic system,space group P1 with a = 7.8772(17),b = 8.2986(18),c = 15.392(3) A,α= 93.360(4),β= 94.609(4),γ= 93.584(4)°,C(18)H(22)N6O3S,Mr= 402.47,V= 998.9(4) A^3,Z= 2,F(000) = 422,Dc =1.335 g/cm^3,μ= 0.194 mm^(-1),the final R = 0.0533 and wR = 0.1329 for 3517 observed reflections with I 2σ(I).The preliminary bioassay results indicate that the target compound has good fungicidal activity against Gibberlla nicotiancola in EC50 value and F.O.f.sp.niveum in EC(95) value.
基金supported by the National Natural Science Foundation of China(No.21073141)the Shaanxi Provincial Education Department Foundation(No.2013JK0666)
文摘A Schiff base was synthesized by 3-methyl-4-amino-5-ethoxycarbonyl-methylsul- fanyl-1,2,4-triazole with 3-nitrobenzaldehyde. The structure was confirmed by IH NMR, IR, H RMS, TGA techniques and X-ray diffraction. The crystal belongs to monoclinic system, space group P21/c, with a = 8.965(2), b = 21.903(5), c = 9.197(2) ,A, β = 114.011(4)°, CIaH15NsOnS, Mr = 349.08, V= 1649.7(6) A3, De = 1.407 g·cm-3, Z = 4, F(000) = 728,μ =0.226 mm1, the final R = 0.0574 and wR = 0.1336 for 2932 unique reflections with 1 〉 2σ(I). Furthermore, the biological activity to four vegetable pathogens has been tested. The title compound exhibits better biological activity to four vegetable pathogens compared to the Schiff base without 5-ethoxycarbonyl and to Gibberlla saubinetti in EC95 compared with triadimefon.