1-(3,4-Dihydro-4-oxoquinazolin-3-yl)aziridines (Q-substituted aziridines): ring-opening reactions with C–N bond cleavage and preparation of Q-free chirons
作者:Robert S. Atkinson、Andrew P. Ayscough、William T. Gattrell、Tony M. Raynham
DOI:10.1039/b004798h
日期:——
The presence of the Q group in ring-opening reactions of N-(Q)-aziridines 3, 4, 5 and 6 has been found to be advantageous in the following ways, (i) nucleophilic ring-opening by cuprate or by azide with inversion of configuration is assisted by the electron-withdrawing character of the Q group, (ii) ring-opening of aziridines 5 or 6 to the corresponding alcohols 36 and 23 with retention of configuration
Q基团的开环反应中存在ñ - (Q)-aziridines 3,4,5和6已被发现是在以下方面是有利的,(i)在铜氧化物或通过叠氮化物与亲核开环Q基团的吸电子特性有助于构型的反转,(ii)氮丙啶 5或6到相应酒类 保留配置的36和23可以通过Q组的参与来完成:羰 氧气变成 羟基 氧气 酒精 产物,(iii)吸电子Q基团和环应变的共同作用允许制备单个 氮丙啶 N-反相器3和4,它们的开环为氯化氢 在 二氯甲烷进行补充立体化学。Q组也被认为与环的开环有关氮丙啶 5和6介导钐(III硝酸盐)六水合物主要保留配置。还原去除从这些开环产物的Q基团的给chirons 12,19和21。