A Convenient Preparation of 7-Bromo-2<i>H</i>-1,4-benzothiazine-3,5,8(4<i>H</i>)-trione and Its Application in the Synthesis of the Conaquinone B Skeleton
作者:Ricardo Tapia、Lorena Villalobos、Cristian Salas
DOI:10.1055/s-2007-990895
日期:2007.12
7-Bromo-2H-1,4-benzothiazine-3,5,8(4H)-trione was synthesized by reaction of 5-bromo-2-nitro-1,4-benzoquinone with methyl thioglycolate followed by reductive cyclization and oxidation. The Diels-Alder reaction of the product quinone with myrcene afforded the expected naphthothiazine.