Stereoselective functionalization of 1-alkoxy-2-(phenylethynyl)cyclopropanes via lithiation and subsequent reactions with electrophilic reagents
作者:V. D. Gvozdev、K. N. Shavrin、A. A. Ageshina、O. M. Nefedov
DOI:10.1007/s11172-017-1819-3
日期:2017.5
enylethynyl)cyclopropanes undergo lithiation at the hydrogen atom in the α-position to the triple bond on treatment with BuLi in THF at–(65—70) °C. The resulting organolithium derivatives react with acetaldehyde, acetone, dimethyl disulfide, and methyl chloroformate giving the corresponding alcohols, sulfides, and esters with the yields up to 69% with complete retention of cyclopropane ring stereoconfiguration
摘要反式-1-烷氧基-2-(苯基乙炔基)环丙烷在-(65-70) °C下在THF中用BuLi处理后,在α位氢原子与三键发生锂化。所得有机锂衍生物与乙醛、丙酮、二甲基二硫化物和氯甲酸甲酯反应,得到相应的醇、硫化物和酯,收率高达 69%,并完全保留环丙烷环立体构型。得到的3-烷氧基-2,2-二甲基-1-(苯乙炔基)环丙烷羧酸甲酯和相应的酸在加入水分子或HCl时容易开环。