Stereoselective reactions. 28. Effects of the alkyl group at the amide nitrogen of chiral bidentate lithium amides on enantioselective deprotonation reaction
作者:Kazumasa Aoki、Kiyoshi Tomioka、Hiroshi Noguchi、Kenji Koga
DOI:10.1016/s0040-4020(97)00901-0
日期:1997.10
chiral bidentate lithium amides () having an alkyl- or a fluoroalkyl substituent at the amide nitrogen was examined. having a 2,2,2-trifluoroethyl group at the amide nitrogen was found to be an excellent chiral base for the present deprotonation reaction. Structures of in solution and solid state are discussed.
考察了在酰胺氮上具有烷基或氟烷基取代基的手性二齿锂酰胺()对4-取代的环己酮()的对映选择性去质子化。发现在酰胺氮上具有2,2,2-三氟乙基的是本去质子化反应的极好的手性碱。讨论了溶液和固态的结构。