Zinc-Mediated Chain Extension Reaction of 1,3-Diketones to 1,4-Diketones and Diastereoselective Synthesis of <i>trans</i>-1,2-Disubstituted Cyclopropanols
作者:Song Xue、Le-Zhen Li、Yong-Kang Liu、Qing-Xiang Guo
DOI:10.1021/jo051950b
日期:2006.1.1
A variety of 1,3-diketones can be efficiently converted into the corresponding 1.4-diketones and trans-1,2-disubstituted cyclopropanols by using organozinc species in one-pot reactions. It was found that 2.3 equiv of CF3CO2ZnCH2I was effective to give the corresponding chain-extended products in 44-85% yields, while a mixture of organozinc species formed from 4.0 equiv of Et2Zn, 2.0 equiv of CF3CO2H, and 4.0 equiv of CH2I2 resulted in the formation of trans-1,2-disubstituted cyclopropanols with quite good yields and diastereoselectivity.