作者:G. William Daub、James P. Edwards、Carol R. Okada、Jana Westran Allen、Claudia Tata Maxey、Matthew S. Wells、Alexandra S. Goldstein、Michael J. Dibley、Clarence J. Wang、Daniel P. Ostercamp、Steven Chung、Paula Shanklin Cunningham、Martin A. Berliner
DOI:10.1021/jo9614250
日期:1997.4.1
The ortho ester Claisen rearrangement of trisubstituted allylic alcohols exhibits significant levels of diastereoselection. In E allylic alcohols, a 1,3-diaxial interaction develops in the chairlike transition state leading to the anti isomer, rendering the reaction syn selective by a factor of 3-5 to 1. In Z allylic alcohols, the 1,3-diaxial interaction develops in the transition state leading to
三取代的烯丙基醇的原酸酯克莱森重排表现出显着水平的非对映选择性。在E烯丙基醇中,在椅子状过渡状态下会形成1,3-二轴相互作用,从而导致反异构体,使反应的Syn选择性达到3-5:1。在Z烯丙基醇中,1,3-二轴相互作用相互作用以过渡状态发展,导致顺式异构体,产生6-15对1的反式:顺式选择性。顺式异构体的相对立体化学是通过霉菌毒素葡萄孢菌素的合成独立确定的。