Conformationally Rigid Chiral Pyridine N-Oxides as Organocatalyst: Asymmetric Allylation of Aldehydes
作者:Elumalai Gnanamani、Nagamalla Someshwar、Chinnasamy Ramaraj Ramanathan
DOI:10.1002/adsc.201200115
日期:2012.8.13
unit with a conformationally rigid chiral backbone has been designed and synthesized in an enantiomerically pure form to utilize in the Lewis base-catalyzed Sakurai–Hosomi–Denmark-type allylation reaction. The chiral pyridine N-oxide in 1:1 mixture of chloroform and 1,1,2,2-tetrachloroethane produced the homoallylic alcohols in up to 98% yield and up to 94% ee.
具有构象刚性手性骨架的吡啶单元已被设计和合成为对映体纯形式,可用于Lewis碱催化的Sakurai–Hosomi–Denmark型烯丙基化反应。在氯仿和1,1,2,2-四氯乙烷1:1混合物中的手性吡啶N-氧化物生成的均烯丙基醇的收率高达98%,ee高达94%。