Regio- and Stereoselective Hydrochlorination/Cyclization of 1,<i>n</i>-Enynes by FeCl<sub>3</sub> Catalysis
作者:Jicheng Hou、Junhao Yin、Hao Han、Qirui Yang、Yougui Li、Yazhou Lou、Xiang Wu、Yang’en You
DOI:10.1021/acs.orglett.3c01495
日期:2023.6.16
A highly regio- and stereoselective hydrochlorination/cyclization of enynes has been reported by FeCl3 catalysis. A variety of enynes undergo this cyclization transformation with acetic chloride as the chlorine source and H2O providing protons via a cationic pathway. This protocol provides a cheap, simple, stereospecific, and effective cyclization to afford heterocyclic alkenyl chloride compounds as
据报道,FeCl 3催化可实现高度区域和立体选择性的烯炔氢氯化/环化。多种烯炔以乙酰氯为氯源,H 2 O 通过阳离子途径提供质子,进行环化转化。该方案提供了一种廉价、简单、立体特异性和有效的环化,以提供具有高产率(≤98%)和区域选择性的Z异构体形式的杂环氯烯基化合物。
Friedel–Crafts cyclization of tertiary alcohols using bismuth(III) triflate
作者:Baskar Nammalwar、Richard A. Bunce
DOI:10.1016/j.tetlet.2013.06.026
日期:2013.8
Bismuth(III) triflate [Bi(OTf)(3)] has been developed as an efficient and mild catalyst for intramolecular Friedel-Crafts cyclizations of tertiary alcohols to prepare disubstituted tetrahydronapthalenes, chromans, thiochromans, tetrahydroquinolines, and tetrahydroiso-quinolines. The method represents a unified strategy to synthesize a variety of ring systems from tertiary alcohols using a common Lewis acid. (C) 2013 Elsevier Ltd. All rights reserved.