Pyrimidines. 65. Synthesis of 6-substituted thieno[2,3-<i>d</i>]pyrimidine-2,4(1<i>H</i>,3<i>H</i>)-diones
作者:Kosaku Hirota、Mitsuomi Shirahashi、Shigeo Senda、Motoi Yogo
DOI:10.1002/jhet.5570270345
日期:1990.3
Several 6-substituted thieno[2,3-d]pyrimidine-2,4(1H,3H)-dione derivatives were synthesized. 6-Ethoxycarbonyl derivatives 3 and 7 were prepared by treatment of 6-chloro-5-formyluracil 1 and 6-chloro-5-cyanouracil 6 with ethyl 2-mercaptoacetate in the presence of a base. Electrophilic substitution reactions (Vilsmeier-Haack reaction, bromination, and nitration) of 5,6-unsubstituted thieno[2,3-d]pyrimidine
合成了几种6-取代的噻吩并[2,3 - d ]嘧啶-2,4(1 H,3 H)-二酮衍生物。通过在碱存在下用2-巯基乙酸乙酯处理6-氯-5-甲酰基尿嘧啶1和6-氯-5-氰尿嘧啶6来制备6-乙氧基羰基衍生物3和7。通过6-巯基尿嘧啶8与氯乙醛缩合制得的5,6-未取代的噻吩并[2,3- d ]嘧啶9的亲电取代反应(Vilsmeier-Haack反应,溴化和硝化),得到相应的6-甲酰基-, 6-溴和6-硝基硫代[2,3- d分别是]嘧啶10、15和16。