Exploring the Stereoselectivity in the Peterson Reaction of Several 2-Substituted 1-Azabicyclo[2.2.2]octan-3-ones
作者:Janne E. Tønder、Mikael Begtrup、John Bondo Hansen、Preben H. Olesen
DOI:10.1016/s0040-4020(00)00015-6
日期:2000.2
The Peterson reaction between a series of 2-substituted 1-azabicyclo[2.2.2]octan-3-ones and 3-methyl-5-trimethylsilanylmethyl isoxazole (1) was explored. (Z)-Stereoselectivity was obtained with all 2-substituents, ranging from 65:35 for benzyl to 95:5 for phenylsulphanyl. Different bases were investigated, revealing that an organolithium base is necessary for the reaction to occur. A transition state
探索了一系列2-取代的1-氮杂双环[2.2.2]辛烷-3-酮与3-甲基-5-三甲基甲硅烷基甲基异恶唑(1)之间的Peterson反应。(Z)-具有所有2-取代基的立体选择性,范围从苄基的65:35到苯磺酰基的95:5。研究了不同的碱,发现有机锂碱是反应发生所必需的。提出了一种过渡态,该过渡态涉及一个四元环,其中锂离子与α硅烷基共价键合,并与羰基氧螯合。