Diastereoselective cyclopropanation of cyclic enones with methyl dichloroacetate anion
作者:Ana Escribano、Concepción Pedregal、Rosario González、Alejandro Fernández、Keith Burton、Gregory A Stephenson
DOI:10.1016/s0040-4020(01)00949-8
日期:2001.11
The reaction of alpha,beta -unsaturated cyclic ketones with methyl dichloroacetate anion in the presence of DBU leads to the corresponding bicyclic chlorocyclopropanes in a highly diastereoselective fashion. In the cases of 2-cyclopentenone and 2-cyclohexenone the reaction affords exclusively the endo-Cl isomer. (C) 2001 Elsevier Science Ltd. All rights reserved.