dihydropyrimidinones derivatives were synthesized in high yields by one pot three component Biginelli condensation from aldehyde, β keto ester and urea in ethanol,while cobalt chloride hexahydrate was used as a catal...dihydropyrimidinones derivatives were synthesized in high yields by one pot three component Biginelli condensation from aldehyde, β keto ester and urea in ethanol,while cobalt chloride hexahydrate was used as a catalyst.This modified Biginellis reaction not only makes the reaction period short,the operation simple,but also gives high yields.展开更多
The title compound 3 was synthesized from diethylguanidine nitrate（2） obtained from diethylamine, CaCN2 and HNO3. The mixture consisted of 0.5 mol 2, 0.55 mol acetonyl propionate, 3 g benzyltriethylammonium chloride...The title compound 3 was synthesized from diethylguanidine nitrate（2） obtained from diethylamine, CaCN2 and HNO3. The mixture consisted of 0.5 mol 2, 0.55 mol acetonyl propionate, 3 g benzyltriethylammonium chloride, and 44 g NaOH was refluxed for 4 hours to give 85 g 3, in yield 94.6%.展开更多
Synthesis steps of 4,5 diamino 6 hydroxy 2 mercaptopyrimidine were improved on cyclocondensation of ethyl cyanoacetate with thiourea,nitrosation and reduction to obtain the product in 89% yield with high purity on ind...Synthesis steps of 4,5 diamino 6 hydroxy 2 mercaptopyrimidine were improved on cyclocondensation of ethyl cyanoacetate with thiourea,nitrosation and reduction to obtain the product in 89% yield with high purity on industrial scale.展开更多
文摘dihydropyrimidinones derivatives were synthesized in high yields by one pot three component Biginelli condensation from aldehyde, β keto ester and urea in ethanol,while cobalt chloride hexahydrate was used as a catalyst.This modified Biginellis reaction not only makes the reaction period short,the operation simple,but also gives high yields.
文摘The title compound 3 was synthesized from diethylguanidine nitrate（2） obtained from diethylamine, CaCN2 and HNO3. The mixture consisted of 0.5 mol 2, 0.55 mol acetonyl propionate, 3 g benzyltriethylammonium chloride, and 44 g NaOH was refluxed for 4 hours to give 85 g 3, in yield 94.6%.
文摘Synthesis steps of 4,5 diamino 6 hydroxy 2 mercaptopyrimidine were improved on cyclocondensation of ethyl cyanoacetate with thiourea,nitrosation and reduction to obtain the product in 89% yield with high purity on industrial scale.
基金2013年国家级大学生创新创业训练计划项目(201313256001)湖北师范学院硕士研究生创新科研基金项目(1051320130216)+1 种基金National Undergraduate Training Programs for Innovation and Entrepreneurship(201313256001)Postgraduate Innovation Scientific Research Foundation of Hubei Normal University(1051320130216)
