Stereoselective functionalization of pyrrolidinone moiety towards the synthesis of salinosporamide A
作者:Julien Barbion、Geoffroy Sorin、Mohamed Selkti、Esther Kellenberger、Rachid Baati、Stefano Santoro、Fahmi Himo、Ange Pancrazi、Marie-Isabelle Lannou、Janick Ardisson
DOI:10.1016/j.tet.2012.05.103
日期:2012.8
An important feature of the synthesis of salinosporamide A. a potent proteasome inhibitor, is the establishment of the quaternary stereocenter at C3. A new route has been developed based on the methylation of a functionalized pyrrolidinone. Direct methylation reaction led to the unwanted diastereomer: however, by means of a Corey-Chaykovsky reaction followed by LiAlH4 epoxide opening, the desired alcohol was obtained. The pyrrolidinone was elaborated through a key allylation reaction between a tertiary allyltitanium reagent and an aldehyde bearing a spiroketal moiety in alpha-position. (C) 2012 Elsevier Ltd. All rights reserved.