作者:Stephen A. Kolodziej、Bruce C. Hamper
DOI:10.1016/0040-4039(96)01103-3
日期:1996.7
A series of 1,3-disubstituted-5,6-dihydropyrimidine-2,4-diones 1 are prepared by solid phase organic chemistry using a cyclization-cleavage strategy from readily available amines and isocyanates. An acrylate ester of Wangs resin is treated with primary amines to afford N-substituted β-aminoesters followed by treatment with isocyanates to afford β-ureido ester 4. Cyclization-cleavage of the bound ureido
通过固相有机化学,使用环化裂解策略,从容易获得的胺和异氰酸酯中制备一系列1,3-二取代的5,6-二氢嘧啶-2,4-二酮1。用伯胺处理王氏树脂的丙烯酸酯,得到N-取代的β-氨基酯,然后用异氰酸酯处理,得到β-脲基酯4。结合的脲基酯在酸性条件下的环化裂解,直接形成5,6-二氢嘧啶二酮1。