3 years ago

Collective Syntheses of 2-(3-Methylbenzofuran-2-yl)phenol-Derived Natural Products by a Cascade [3,3]-Sigmatropic Rearrangement/Aromatization Strategy

Collective Syntheses of 2-(3-Methylbenzofuran-2-yl)phenol-Derived Natural Products by a Cascade [3,3]-Sigmatropic Rearrangement/Aromatization Strategy
Chongguo Jiang, Yongxiang Liu, Wei Li, Yanshi Wang, Xinhang Zhang, Jingsheng Lin, Maosheng Cheng, Chuan Du, Chengjun Liu, Xiaoshi Peng, Yingzhan Tang
A cascade [3,3]-sigmatropic rearrangement/aromatization strategy to the synthesis of 2-(3-methylbenzofuran-2-yl)phenol derivatives was developed and applied to the collective syntheses of seven 2-arylbenzofuran-containing natural products, namely glycybenzofuran, glycyuralin E, lespedezol A1, puerariafuran, 7,2′,4′-trihydroxy-3-benzofurancarboxylic acid, coumestrol, and 4′-O-methylcoumestrol. Among them, the total syntheses of glycybenzofuran, glycyuralin E, puerariafuran, 7,2′,4′-trihydroxy-3-benzofurancarboxylic acid, and 4′-O-methylcoumestrol were reported for the first time. The practicality of this novel strategy in preparation of the key intermediates was demonstrated by performing the reaction on gram scale and by synthesizing a series of natural products with 2-(3-methylbenzofuran-2-yl)phenol scaffolds in a common strategy.

Publisher URL: http://dx.doi.org/10.1021/acs.joc.7b02066

DOI: 10.1021/acs.joc.7b02066

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