(±)-angustureine, in three steps and high yields (78%, 76%, 74%, and 66%, respectively) from common aldehyde and the ylide respectives. The key step of this approach is based on an unusual Wittig reaction by using the phase transfer medium (aq. NaOH/CH2Cl2 1:1 or t-BuOK/t-BuOH/CH2Cl2 1:1), affording olefinic intermediates in high yields.
本研究描述了分三个步骤,高收率合成
1,2,3,4-四氢喹啉碱类
生物碱(±)-半胱
氨酸,(±)-cuspareine,(±)-半
乳糖苷和(±)-Angustureine)(78分别从普通醛和叶立德中分离得到1%,76%,74%和66%)。此方法的关键步骤基于使用相转移介质(NaOH / CH 2 Cl 2 1:1
水溶液或t -BuOK / t -BuOH / CH 2 Cl 2 1:1
水溶液)进行的不寻常的Wittig反应,从而得到烯烃中间体的收率很高。