An efficient dearomative cyclization of 2-nitrobenzofurans via a thiol-triggered tandem Michael addition/intramolecular Henry reaction has been developed. A range of thiochromeno[3,2-b]benzofuran-11-ols and tetrahydrothieno[3,2-b]benzofuran-3-ols could be obtained in up to 99% yield and up to >20:1 dr. The valuable thiochromone fused benzofurans could be prepared with the reaction of 2-nitrobenzofurans and 2-mercaptobenzaldehyde via the tandem dearomative Michael addition/intramolecular Henry reaction/rearomatization/oxidative dehydrogenation process in a one-pot two-step operation. A mechanism for the reaction was tentatively proposed.

中文翻译：

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硫醇引发的串联脱芳构迈克尔加成/2-硝基苯并呋喃的分子内亨利反应：获得含硫多杂环化合物

通过硫醇触发的串联迈克尔加成/分子内亨利反应，开发了一种有效的 2-硝基苯并呋喃脱芳环化方法。可以获得一系列硫代苯并[3,2- b ]苯并呋喃-11-醇和四氢噻吩并[3,2- b ]苯并呋喃-3-醇，收率高达 99%，dr 高达 >20:1。 2-硝基苯并呋喃与2-巯基苯甲醛通过串联脱芳香迈克尔加成/分子内亨利反应/重芳香化/氧化脱氢一锅两步操作制备有价值的硫色酮稠合苯并呋喃。初步提出了该反应的机理。