Asymmetric Catalytic Access to Piperazin-2-ones and Morpholin-2-ones in a One-Pot Approach: Rapid Synthesis of an Intermediate to Aprepitant
作者:Sara Meninno、Alessandra Lattanzi
DOI:10.1021/acs.joc.2c02491
日期:——
A one-pot Knoevenagel reaction/asymmetric epoxidation/domino ring-opening cyclization (DROC) has been developed from commercial aldehydes, (phenylsulfonyl)acetonitrile, cumyl hydroperoxide, 1,2-ethylendiamines, and 1,2-ethanol amines to provide 3-aryl/alkyl piperazin-2-ones and morpholin-2-ones in yields of 38 to 90% and up to 99% ee. Two out of the three steps are stereoselectively catalyzed by a
一锅 Knoevenagel 反应/不对称环氧化/多米诺开环环化 (DROC) 是由商业醛、(苯磺酰基)乙腈、枯基氢过氧化物、1,2-乙二胺和 1,2-乙醇胺开发而成,可提供 3-芳基/烷基哌嗪-2-酮和吗啉-2-酮的产率为 38% 至 90%,ee 高达 99%。三个步骤中的两个是由奎宁衍生的尿素立体选择性催化的。该序列已应用于关键中间体的短对映选择性进入,以两种绝对构型参与强效止吐药阿瑞吡坦的合成。