作者:Zhenlin Tian、Frederic Menard
DOI:10.1021/acs.joc.8b00179
日期:2018.6.1
A unified stereoselective synthesis of 4-substituted kainoids is reported. Four kainic acid analogues were obtained in 8–11 steps with up to 54% overall yields. Starting from trans-4-hydroxy-l-proline, the sequence enables a late-stage modification of C4 substituents with sp2 nucleophiles. Stereoselective steps include a cerium-promoted nucleophilic addition and a palladium-catalyzed reduction. A 10-step
报道了4-取代的类胡萝卜素的统一立体选择性合成。在8-11个步骤中获得了四个海藻酸类似物,总收率高达54%。从反式-4-羟基-1-脯氨酸开始,该序列可以用sp 2亲核试剂对C4取代基进行后期修饰。立体选择性步骤包括铈促进的亲核加成和钯催化的还原。还建立了通往酸21a的10步路线,以实现C4位置的现成功能化。