Divergent reaction pathways in gold-catalyzed cycloisomerization of 1,5-enynes containing a cyclopropane ring: dramatic ortho substituent and temperature effects
作者:Gen-Qiang Chen、Wei Fang、Yin Wei、Xiang-Ying Tang、Min Shi
DOI:10.1039/c6sc00058d
日期:——
Gold-catalyzed cycloisomerization of 1,5-enynes containing a cyclopropanering provides access to cyclobutane-fused 1,4-cyclohexadiene, 1,3-cyclohexadiene, tricyclic cyclobutene and biscyclopropane derivatives.
The cyclopropyl effect on the regioselectivity of coupling reactions involving the lithiation of 1-cyclopropyl-2-arylacetylenes
作者:Shengming Ma、Qiwen He
DOI:10.1016/j.tet.2006.01.009
日期:2006.3
The cyclopropyl effect controlled the regioselectivity of the cross coupling reactions of propargylic/allenylic metallic species with electrophiles affording alkynic cycloproparies. It was proposed that the strain in cyclopropyl ring, which makes the formation of vinylidenecyclopropanes unfavorable, determined the regioselectivity. Control experiment of i-propyl, cyclobutyl, and cyclohexylphenylacetylenes were conducted to support the above speculation. (c) 2006 Elsevier Ltd. All rights reserved.