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。