作者:Rosaria Schettini、Antonella Dentoni Litta、Arianna Sinibaldi、Assunta D'Amato、Alicja M. Araszczuk、Marina Sicignano、Letizia Pagliarulo、Simone Naddeo、Giovanni Pierri、Francesco De Riccardis、Irene Izzo、Giorgio Della Sala
DOI:10.1002/adsc.202400007
日期:2024.4.9
A method for the asymmetric synthesis of phthalides containing a stereogenic γ-carbon has been described. The protocol, based on the arylogous Michael addition to chiral alkenoyl oxazolidinones catalyzed by a crown ether under phase-transfer conditions does not require anhydrous conditions and uses commercially available materials. A complete syn-stereocontrol is achieved and facial diastereoselectivities
描述了一种不对称合成含有立构γ-碳的苯并呋喃酮的方法。该方案基于在相转移条件下由冠醚催化的手性烯酰基恶唑烷酮的芳源迈克尔加成,不需要无水条件并使用市售材料。实现了完整的同步立体控制,并且面部非对映选择性为中等至优秀(62:38 至 99:1 dr)。通过色谱法纯化主要非对映异构体并选择性裂解手性助剂,得到对映体纯迈克尔产物。该方案已应用于艾司西酞普兰的正式合成。