Organometallic-crown reagents. Anti-Cram selectivity via R2CuLi.cntdot.crown and enhanced Cram selectivity via RLi.cntdot.crown and RMgX.cntdot.crown
作者:Yoshinori Yamamoto、Kazuhiro Maruyama
DOI:10.1021/ja00308a054
日期:1985.10
A highly diastereoselective synthesis of (E)-B-2-(1-cyclopropyl-1-alkenyl)-1,3,2-dioxaborinanes. Isolation and oxidation to alkyl cyclopropyl ketones
作者:Narayan G. Bhat、Laura Garcia、Victoriano Tamez
DOI:10.1016/s0040-4039(03)01841-0
日期:2003.9
A convenient, novel synthesis of alkyl cyclopropylketones based on Z-1-bromo-1-alkenylboronate esters is developed. α-Bromo-(Z)-1-alkenylboronate esters readily available from literature procedures smoothly undergo a reaction with cyclopropylmagnesium bromide in tetrahydrofuran to provide the corresponding ‘ate’ complexes. These ‘ate’ complexes undergo intramolecular nucleophilic substitution reactions