α-Alkylation of N–C Axially Chiral Quinazolinone Derivatives Bearing Various ortho-Substituted Phenyl Groups: Relation between Diastereoselectivity and the ortho-Substituent
作者:Osamu Kitagawa、Mizuki Matsuoka、Asumi Iida
DOI:10.1055/s-0037-1610110
日期:2018.10
C–N axially chiral structure at ambient temperature. The reactions of alkyl halides with the anionic species prepared from these quinazolinones were systematically explored. The α-alkylation reactions proceeded with diastereoselectivities ranging from 1:1 to >50:1, depending upon the steric bulk of the ortho-substituent, to afford products having the elements of axial and central chirality in high yields
带有各种邻位取代苯基的 2-Ethylquinazolin-4-one 衍生物被证明在环境温度下具有稳定的 C-N 轴向手性结构。系统地研究了卤代烷与由这些喹唑啉酮制备的阴离子物质的反应。α-烷基化反应以 1:1 到 >50:1 的非对映选择性进行,这取决于邻位取代基的空间体积,以高产率(85-98%)提供具有轴和中心手性元素的产物.