Synthesis of asymmetric 3,5-diaryl-4H-1,2,6-thiadiazin-4-ones via Suzuki–Miyaura and Stille coupling reactions
作者:Heraklidia A. Ioannidou、Panayiotis A. Koutentis
DOI:10.1016/j.tet.2012.06.079
日期:2012.9
6-thiadiazin-4-one (1) via a multi-step protocol: selective nucleophilic mono-chloro substitution gives either the mono-methoxy or benzyloxy substituted mono-chlorothiadiazinones that can be phenylated via Suzuki–Miyaura coupling. Subsequent BBr3 mediated dealkylation gives 3-hydroxy-5-phenyl-4H-1,2,6-thiadiazin-4-one (9) that can be activated by a modified Finkelstein halodehydroxylation via the triflate,
不对称的3,5-二芳基取代的4 H -1,2,6-噻二嗪-4-酮可通过3,5-二氯-4 H -1,2,6-噻二嗪-4-酮(1)通过多步骤协议:选择性亲核单氯取代产生单甲氧基或苄氧基取代的单氯噻二嗪酮,可以通过Suzuki–Miyaura偶联将其苯苯基化。随后的BBr 3介导的脱烷基反应生成3-羟基-5-苯基-4 H -1,2,6-噻二嗪-4-酮(9),可以通过三氟甲磺酸酯通过修饰的Finkelstein卤代羟基化反应进行活化,从而可以使用Suzuki进行进一步的芳基化反应–Miyaura或Stille偶联化学。