Microwave-assisted Claisen rearrangement of naphthyl 2-propynyl ethers: synthesis of naphthofurans
作者:V.S. Prasada Rao Lingam、Dnyaneshwar H. Dahale、Kagga Mukkanti、Balasubramanian Gopalan、Abraham Thomas
DOI:10.1016/j.tetlet.2012.08.053
日期:2012.10
An efficient two-step approach for the synthesis of naphtho[1,2-b]furans and naphtho[2,1-b]furans has been developed. Various functionalized propargyl alcohols were etherified with alpha- or beta-naphthol under Mitsunobu reaction conditions to give naphthyl 2-propynyl ethers, which underwent a facile microwave-assisted Claisen rearrangement and concomitant anionic cyclization to yield naphthofuran derivatives under basic reaction conditions. (c) 2012 Elsevier Ltd. All rights reserved.
Diphenyl-Diselenide-Mediated Domino Claisen-Type Rearrangement/Cyclization of Propargylic Aryl Ethers: Synthesis of Naphthofuran-2-carboxaldehyde Derivatives
作者:Jun-Dan Fang、Xiao-Biao Yan、Wu-Jie Lin、Yi-Chuan Zhao、Xue-Yuan Liu
DOI:10.1021/acs.orglett.9b02942
日期:2019.9.20
A diphenyl-diselenide-mediated Claisen-type rearrangement/cyclization of propargylic arylethers under metal-free conditions is developed, affording various naphthofuran-2-carboxaldehydes in moderate to excellent yield. The broad substrate scope and excellent functional group compatibility suggest that it can be a straightforward and powerful method to access naphthofuran-2-carboxaldehydes in a highly