Regioselective synthesis of α,α-dialkylcyclopentanones from 1-hydroxycyclobutanecarboxylic acid or from O-protected cyclobutanone cyanohydrin
作者:Karine Estieu、Jean Ollivier、Jacques Salaün
DOI:10.1016/s0040-4020(98)00448-7
日期:1998.7
1-(1-Hydroxyalkyl)cylobutanols 4a-f, readily available either from 1-hydroxycyclobutane carboxylic acid or from O-protected cyclobutanone cyanohydrin, appeared the most suitable precursors for a regioselective synthesis of cyclopentanones α,α-disubstituted with various similar or different alkyl, alkenyl, aryl or cycloalkyl groups. The key steps consist of acid or Grignard reagent induced C4→C5 ring
1-(1-羟烷基)环丁醇4a-f可以从1-羟基环丁烷羧酸或O保护的环丁酮氰醇中轻松获得,它们是最合适的前体,用于区域选择性合成环戊酮α,α-二取代的区域,其相似或不同烷基,烯基,芳基或环烷基。关键步骤包括酸或格氏试剂引起的C 4 →C 5环膨胀。