The preparation of polymer bound β-ketoesters and their conversion into an array of oxazoles
作者:Bruce Clapham、Sang-Hyeup Lee、Guido Koch、Jürg Zimmermann、Kim D. Janda
DOI:10.1016/s0040-4039(02)01076-6
日期:2002.7
A series of diverse polymer bound beta-ketoesters have been prepared using a transesterification reaction between t-butyl beta-ketoesters and a hydroxybutyl functionalized JandaJel resin. Additionally, these highly useful polymer bound substrates have also been prepared using a transesterification reaction with commercially available methyl or ethyl beta-ketoesters using lithium perchlorate as a catalyst. The polymer bound beta-ketoesters were then converted into the corresponding alpha-diazo-beta-ketoesters using standard diazo transfer conditions and these products were utilized in the synthesis of an array of oxazoles. (C) 2002 Elsevier Science Ltd. All rights reserved.