Highly Enantioselective Organocatalytic Oxidative Kinetic Resolution of Secondary Alcohols Using Chiral Alkoxyamines as Precatalysts: Catalyst Structure, Active Species, and Substrate Scope
作者:Keiichi Murakami、Yusuke Sasano、Masaki Tomizawa、Masatoshi Shibuya、Eunsang Kwon、Yoshiharu Iwabuchi
DOI:10.1021/ja509766f
日期:2014.12.17
The development and characterization of enantioselective organocatalytic oxidative kinetic resolution (OKR) of racemic secondary alcohols using chiral alkoxyamines as precatalysts are described. A number of chiral alkoxyamines have been synthesized, and their structure-enantioselectivity correlation study in OKR has led us to identify a promising precatalyst, namely, 7-benzyl-3-n-butyl-4-oxa-5-azahomoadamantane
描述了使用手性烷氧基胺作为预催化剂的外消旋仲醇的对映选择性有机催化氧化动力学拆分 (OKR) 的开发和表征。已经合成了许多手性烷氧基胺,它们在 OKR 中的结构-对映选择性相关性研究使我们确定了一种有前途的前催化剂,即 7-苄基-3-正丁基-4-氧杂-5-氮杂高金刚烷,它提供了各种手性脂肪族仲醇(ee 高达 >99%,k(rel) 高达 296)。在一项机理研究中,含氯氧铵物种被确定为烷氧基胺预催化剂原位生成的活性物种,并且发现氯原子对于高反应性和对映选择性至关重要。