TFA-promoted sulfonation/cascade cyclization of 2-propynolphenols with sodium sulfinates to 4-sulfonyl 2H-chromenes under metal-free conditions

Literature Information

Publication Date 2019-07-19
DOI 10.1039/C9QO00712A
Impact Factor 5.281
Authors

Tao Yang, Peihao Kou, Fengyan Jin, Xian-Rong Song, Jiang Bai, Haixin Ding, Qiang Xiao, Yong-Min Liang


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Abstract

A novel, efficient and metal-free cascade sulfonylation/cyclization of 2-propynolphenols with commercially available sodium sulfinates was developed for the synthesis of 4-sulfonyl 2H-chromenes under mild conditions. The reaction occurred by the sodium sulfinates’ nucleophilic addition of the allylene carbocation intermediate followed by a 6-endo-trig pathway. Additionally, this approach avoids the use of an oxidant or a photo-radical inducer and the reaction can tolerate a wide variety of functional groups in good yields.

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