Thiophilic Lewis acids (e.g. zinc iodide) have a pronounced catalytic effect on the formal [2+2] cycloaddition of alkynyl silyl sulfides 2 and Schiff bases 3 to give 2-azetidinethiones 4. In contrast to uncatalyzed reactions, a large number of functionalities is tolerated and yields are significantly improved.
亲
硫路易斯酸(例如
碘化锌)对炔基
硅硫化物 2 和席夫碱 3 的正式 [2+2] 环加成反应具有明显的催化作用,生成 2-氮杂
环丁烷硫醇 4。与未催化的反应相比,能够容忍大量功能团,产率显著提高。