TiCl<sub>4</sub>-Mediated Preparation of Thiophthalide Derivatives via Formal Thio-Passerini Reactions
作者:Sudipta Ponra、Aude Nyadanu、Laurent El Kaïm、Laurence Grimaud、Maxime R. Vitale
DOI:10.1021/acs.orglett.6b01937
日期:2016.8.19
By the formal extension of the Passerini reaction to thiocarbonyl derivatives, the straightforward preparation of thiophthalides is disclosed. This method involves the intermediate formation of a sulfanyl-phthalide and a titanium tetrachloride mediated isocyanide insertion reaction. When tert-butyl thiol is used, thanks to the deprotection of the tert-butyl group, a thiophthalide resulting from a 1
通过将Passerini反应正式扩展为硫代羰基衍生物,公开了直接制备硫代邻苯二甲酸酯的方法。该方法涉及中间体形成硫烷基-邻苯二甲酰和四氯化钛介导的异氰酸酯插入反应。当使用叔丁基硫醇时,由于叔丁基的去保护,分离了由1,5-Mumm重排产生的硫代邻苯二酚。由于TiCl 4的多方面活性,所有步骤可方便地在一个锅中进行,直接从2-甲酰基苯甲酸,叔丁基硫醇和各种异氰酸酯开始。