1-(2-Alkynylphenyl)ketoximes react with Lawesson's reagent catalyzed by InCl3 and cyanuric chloride leading to 4-methylene-4H-benzo[d][1,3]thiazines in good yields. This tandem reaction proceeds with high efficiency through Beckmann rearrangement, thioamide formation, and intramolecular nucleophilic cyclization.
在 InCl3 和
三聚氯氰催化下,1-(2-炔基苯基)乙酮
肟与 Lawesson 试剂发生反应,生成 4-亚甲基-4H-苯并[d][1,3]
噻嗪,收率很高。这一串联反应通过贝克曼重排、
硫代酰胺形成和分子内亲核环化作用高效进行。