Chiral Discrimination of Cryptochiral Saturated Quaternary and Tertiary Hydrocarbons by Asymmetric Autocatalysis
作者:Tsuneomi Kawasaki、Hiroyuki Tanaka、Takashi Tsutsumi、Toshinari Kasahara、Itaru Sato、Kenso Soai
DOI:10.1021/ja061429e
日期:2006.5.1
Chiral discrimination of saturated hydrocarbons has been very difficult to establish, or has not been possible at all. The first chiral discrimination of cryptochiral 5-ethyl-5-propylundecane 1, that is, (n-butyl)ethyl(n-hexyl)(n-propyl)methane, a chiral saturated quaternary hydrocarbon, which is known to exhibit practically no detectable value of optical rotation between 280 and 580 nm, has been accomplished
饱和烃的手性区分很难建立,或者根本不可能。隐手性 5-乙基-5-丙基十一烷 1 的首次手性鉴别,即(正丁基)乙基(正己基)(正丙基)甲烷,一种手性饱和季烃,已知几乎没有检测到280 和 580 nm 之间的旋光度值是通过嘧啶基烷醇的不对称自催化实现的。1 的绝对构型已确定。在(R)-或(S)-1存在下,嘧啶-5-甲醛和二异丙基锌之间的反应分别提供具有91-97%ee的(S)-和(R)-嘧啶基链烷醇。因此,不对称自催化是饱和烃手性鉴别的有力工具。