Microwave-assisted solution phase synthesis of dihydropyrimidine C5 amides and esters
作者:Bimbisar Desai、Doris Dallinger、C. Oliver Kappe
DOI:10.1016/j.tet.2005.12.061
日期:2006.5
Multifunctionalized dihydropyrimidine-5-carboxylic amides and esters are generated in a multistep sequence integrating a variety of enabling and high throughput technologies such as automated or parallel microwave synthesis, the use of polymer-supported reagents, fluorous synthesis and purification strategies, and a continuous flow hydrogenation system. The key dihydropyrimidine-5-carboxylic acid intermediates
以多步骤顺序生成多官能化的二氢嘧啶-5-羧酸酰胺和酯,其中集成了多种使能和高通量技术,例如自动化或并行微波合成,使用聚合物支持的试剂,氟合成和纯化策略以及连续流动氢化系统。通过苄基或烯丙基β-酮酯与醛和脲/硫脲的Biginelli多组分缩合,然后进行合适的苄基或烯丙基脱保护策略,可通过两步获得关键的二氢嘧啶-5-羧酸中间体。使用聚合物负载的偶联剂,用胺对酸核进行进一步官能化,或者使用光延化学,通过醇对醇进行进一步官能化,分别提供所需的酰胺或酯。