Chiron based synthesis of isocoumarins: reactivity of α-substituted carboxylic acids
作者:Aisha Saddiqa、Abdul R. Raza、David StC. Black、Naresh Kumar
DOI:10.1016/j.tetasy.2014.03.019
日期:2014.5
The asymmetric synthesis of a novel (S)-isocoumarin has been attempted in a single step by the coupling of homophthalic acid with (S)-N-protected amino acids and alpha-chloroacids at high temperature by exploiting a chiral pool methodology. The coupling of homophthalic acid with N-protected (S)-amino acids gave exclusion of the carboxyl/alkyl group. However, coupling of homophthalic acid with alpha-chloro-acids afforded asymmetric isocoumarins in high yield. (C) 2014 Elsevier Ltd. All rights reserved.