Studies into diastereoselective Dötz benzannulations for the synthesis of axially chiral biaryls
摘要:
A series of racemic chiral ortho substituents on 1-phenythex-1-yne have been found to control the atroposelective formation of a biaryl from Dotz benzannulation with pentacarbonyl(methoxyphenylmethylene)chromium(0). The results show there is a subtle balance between the chiral ortho substituent controlling atroposelectivity with a dr 3-5:1 and allowing benzannulation to proceed in yields of 44-67%. (C) 2003 Elsevier Ltd. All rights reserved.
Molecular iodine mediated cyclization reactions of 2-(1-alkynyl)benzylic alcohols to substituted indenones
作者:Chengyu Wang、Jingyu Yang、Xingcan Cheng、Ende Li、Yanzhong Li
DOI:10.1016/j.tetlet.2012.06.030
日期:2012.8
efficient I-2-mediated approach to the synthesis of disubstituted indenones from readily available 2-alkynylbenzyl alcohols in the presence of H2O has been developed. These results are different from the known iodocyclization reactions in which O-containing heterocycles are obtained. (c) 2012 Elsevier Ltd. All rights reserved.