Gold catalysis: benzanellation versus alkylidenecyclopentenone synthesis
摘要:
A series of different furan-yn-ols were prepared by a three-step sequence. Their reaction with Gagosz's catalyst Ph3PAuNTf2 depends strongly on the substitution pattern of the Substrate and the quality of the leaving group. Benzofurans, alkylidenecyclopentenones or Meyer-Schuster type products can be obtained. Improving the leaving group quality leads to the preferred formation of benzofurans. (C) 2009 Elsevier Ltd. All rights reserved.
The efficient synthesis of substituted 2-methylbenzofurans
作者:Sergei G. Mikhalyonok、Aliaxandr S. Arol、Dmitri A. Litvinau、Nina M. Kuz’menok、Vladimir S. Bezborodov
DOI:10.1007/s10593-019-02443-3
日期:2019.3
The efficientsynthesis of substituted 2-methylbenzofurans by aromatization of accessible allyl-substituted cyclohex-2-enones in the presence of iodine followed by dehydroiodination of the 2-iodomethyl-2,3-dihydrobenzofuran intermediate is described.