The Catalytic Diastereo- and Enantioselective Claisen Rearrangement of 2-Alkoxycarbonyl-Substituted Allyl Vinyl Ether
作者:Lars Abraham、Marleen Körner、Pia Schwab、Martin Hiersemann
DOI:10.1002/adsc.200404051
日期:2004.9
stereogenic double bonds is described. A combination of the highly Lewis acidic [Cu(S,S)-tert-Bu-box}](H2O)2(SbF6)2 complex and molecular sieves served as catalyst and afforded the Claisen rearrangement products, substituted and functionalized α-keto esters, in high yield with a remarkable diastereo- and enantioselectivity. The influence of ligand structure, counterion and allyl vinyl ether double bond configuration
描述了含有两个立体双键的2-烷氧基羰基取代的烯丙基乙烯基醚的催化不对称克莱森重排。高路易斯酸性[Cu (S,S)-叔-Bu-box}](H 2 O)2(SbF 6)2的组合复杂的分子筛充当催化剂,并提供了高产的Claisen重排产物,取代和官能化的α-酮酯,具有非对映选择性和对映选择性。简要研究了配体结构,抗衡离子和烯丙基乙烯基醚双键构型对重排立体选择性的影响。我们提出了路易斯酸的速率加速作用的解释以及用于解释和预测铜双(恶唑啉)催化的克莱森重排的立体化学过程的立体化学模型。