A new preparative procedure was developed for the synthesis of spiro-fused 1,4-benzothiazines by thermal heterocyclization of S-benzyl and S-phenacyl derivativcs of o-indothiophenol.
A new preparative procedure was developed for the synthesis of spiro-fused 1,4-benzothiazines by thermal heterocyclization of S-benzyl and S-phenacyl derivativcs of o-indothiophenol.