Application of Thio-Ugi Adducts for the Preparation
of Benzo[<i>b</i>]thiophene and S‑Heterocycle Library
via Copper Catalyzed Intramolecular C–S Bond Formation
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Abstract
Fused
heterocycles, such as benzo[<i>b</i>]thiophene,
thiochroman, benzo[<i>b</i>][1,4]thiazine, and 1,4-benzothiazepine
were generated from thio-Ugi adducts containing a thioamide group
through copper-catalyzed intramolecular C–S bond formation
under microwave irradiation