作者:Lucjan Strekowski、Rebecca A. Watson、Michelle A. Faunce
DOI:10.1055/s-1987-28013
日期:——
The addition reaction of 2,4-bis(methylthio)pyrimidine or 2, 4-dimethoxypyrimidine with organolithium reagents produces unstable 6-substituted 2,4-bis(methylthio)-5,6-dihydropyrimidines and 2, 4-dimethoxy-5,6-dihydropyrimidines, respectively. The regioselective hydrolysis of these addition products gives the respective 6-substituted 2-methylthio-5,6-dihydropyrimidin-4(3H)ones and 6-substituted 2-methoxy-5,6-dihydropyrimidin-4(3H)ones. The methoxy products can be hydrolyzed further to 6-substituted dihydrouracils.
2,4-双(甲硫基)嘧啶或2,4-二甲氧基嘧啶与有机锂试剂的加成反应生成不稳定的6-取代2,4-双(甲硫基)-5,6-二氢嘧啶和2,4-二甲氧基-5,6-二氢嘧啶。对这些加成产物进行区域选择性水解可得到相应的6-取代2-甲硫基-5,6-二氢嘧啶-4(3H)酮和6-取代2-甲氧基-5,6-二氢嘧啶-4(3H)酮。甲氧基产物可以进一步水解为6-取代二氢尿嘧啶。