作者:Lucjan Strekowski、Donald Harden、Rebecca A. Watson
DOI:10.1055/s-1988-27469
日期:——
6-Substituted 2,4-bis(methylthio)pyrimidines 5 are obtained in the reaction of (i) 5-bromo-2,4-bis(methylthio)pyrimidine (1) with aryllithium and heteroaryllithium reagents, followed by spontaneous dehydrobromination of the intermediate bromo dihydropyrimidines 3 or (ii) 2,4-bis(methylthio)pyrimidine (2) with alkyllithium, aryllithium, and heteroaryllithium reagents, followed by aromatization of the intermediate dihydropyrimidines 4 with DDQ. Hydrolysis of these compounds produces 6-substituted uracils 6.
6-取代的2,4-双(甲硫基)嘧啶5是在以下反应中获得的:(i) 5-溴-2,4-双(甲硫基)嘧啶(1)与芳基锂和杂芳基锂试剂反应,随后中间产物溴代二氢嘧啶3自发去溴化;或 (ii) 2,4-双(甲硫基)嘧啶(2)与烷基锂、芳基锂和杂芳基锂试剂反应,随后用DDQ对中间产物二氢嘧啶4进行芳构化。这些化合物的水解产生6-取代的尿嘧啶6。