Gosteli−Claisen Rearrangement: Substrate Synthesis, Simple Diastereoselectivity, and Kinetic Studies
作者:Julia Rehbein、Sabine Leick、Martin Hiersemann
DOI:10.1021/jo802303m
日期:2009.2.20
kinetic studies on the uncatalyzed [3,3]-sigmatropic rearrangement of 2-alkoxycarbonyl-substituted allyl vinyl ethers are reported. Apparently first reported by Gosteli in 1972, this variation of a Claisenrearrangement enjoyed a shadowy existence for three decades until its potential for the development of a catalytic asymmetric Claisenrearrangement was discovered. Inspired by this development, we have
and experimental study on the Claisenrearrangement of a 2-alkoxycarbonyl-substituted allyl vinyl ether in the presence of thioureas as potential noncovalent organocatalysts has been performed. DFT calculations employing different basis sets were utilized to predict a catalytic cycle for the thiourea-catalyzed Claisenrearrangement. The nature of the transitionstate in the presence and absence of