A novel acylative ring cleavage of benzothieno[3,2-b]pyran-4-ols: application to the synthesis of dibenzothiophenes and fused-ring derivatives
作者:Christopher D. Gabbutt、John D. Hepworth、B. Mark Heron、Jean-Luc Thomas
DOI:10.1039/a900730j
日期:——
The benzothienopyranols 3, readily available from the ketone 1, are transformed to the carbamates 5 on treatment with N,N-dimethylcarbamoyl chloride, subsequent thermal electrocyclisation provides access to dibenzothiophene derivatives 6 and 11–13.
苯并噻吩吡喃醇 3 通过酮 1 方便获得,处理后与 N,N-二甲基氨基甲酰氯反应生成氨基甲酸酯 5,随后热电环化可获得二苯并噻吩衍生物 6 和 11–13。