Reactions of Lithiated 1,2,3-Thiadiazoles: Synthesis of 4-Substituted 1,2,3-Thiadiazoles
作者:Edward W. Thomas、David C. Zimmermann
DOI:10.1055/s-1985-31395
日期:——
Metalation of 5-phenyl-1,2,3-thiadiazole (2) with methyllithium affords 4-lithio-5-phenyl-1,2,3-thiadiazole, which is stable and reacts with aldehydes and ketones to give 4-substituted 1,2,3-thiadiazoles 3 in excellent yields. Treatment of 4-phenyl-1,2,3-thiadiazole (1) with lithium diisopropylamide, in the presence of chlorotrimethylsilane, affords 4-phenyl-5-trimethylsilyl-1,2,3-thiadiazole (7).
将5-苯基-1,2,3-噻二唑(2)与甲基锂金属化反应,生成稳定的4-锂-5-苯基-1,2,3-噻二唑,该化合物能与醛和酮反应,以优异的产率得到4-取代的1,2,3-噻二唑(3)。在三甲基氯硅烷的存在下,用二异丙基氨基锂处理4-苯基-1,2,3-噻二唑(1),得到4-苯基-5-三甲基硅基-1,2,3-噻二唑(7)。