(2,3-Dihydrobenzo[b][1,4]oxathiin-3-yl)methanols were synthesized via reactions of aryloxymethylthiiranes and N-bromosuccinimide (NBS) in DMSO under microwave irradiation. The reaction mechanism was proposed as an intramolecular aromatic electrophilic substitution of 1-bromo-2-(aryloxymethyl)thiiran-1-iums, generated from aryloxymethylthiiranes and NBS, and the subsequent DMSO nucleophilic ring opening reaction of thiiran-1-iums followed by the water displacement. The current method provides a direct and simple strategy in the efficient preparation of (2,3-dihydrobenzo[b][1,4]oxathiin-3-yl)methanols from readily available aryloxymethylthiiranes.

中文翻译：

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NBS / DMSO介导的由芳氧基甲基噻喃合成（2,3-二氢苯并[ b ] [1,4]草酰-3-基）甲醇†

通过芳氧基甲基硫烷和N-溴琥珀酰亚胺（NBS）在DMSO下微波辐射反应合成了（2,3-二氢苯并[ b ] [1,4]氧杂嘧啶-3-基）甲醇。该反应机理被认为是由芳氧基甲基噻喃和NBS生成的1-溴-2-（芳氧基甲基）噻喃-1-鎓的分子内芳族亲电取代，以及随后的噻吩-1-鎓的DMSO亲核开环反应，随后是排水量。当前的方法提供了一种直接和简单的策略，可以从容易获得的芳氧基甲基噻喃有效地制备（2,3-二氢苯并[ b ] [1,4]氧杂蒽-3-基）甲醇。