Stereoselective One-pot Dialkylation of<i>gem</i>-Dihalocyclopropanes by Means of Dialkylcopperlithiums
作者:Katuzi Kitatani、Tamejiro Hiyama、Hitosi Nozaki
DOI:10.1246/bcsj.50.1600
日期:1977.6
(2 and 3) is established by successive treatment with dibutylcopperlithium and several electrophiles. This sequence is found to be stereochemically controllable and is successfully applied to dl-sireninsynthesis. In contrast to the reaction of dibutylcopperlithium, dimethyl- and divinylcopperlithiums convert 1,1-dibromo-2-phenylcyclopropane (1a) into 1-bromo-1-methyl- and 1-bromo-1-vinyl-2-phenylcyclopropanes