Syntheses of Chiral β- and γ-Amino Ethers, Morpholines, and Their Homologues via Nucleophilic Ring-Opening of Chiral Activated Aziridines and Azetidines
作者:Manas K. Ghorai、Dipti Shukla、Aditya Bhattacharyya
DOI:10.1021/jo300002u
日期:2012.4.20
Lewis acid catalyzed quaternary ammonium salt mediated highly regioselective ring-opening of chiral activated aziridines and azetidines with alcohols to nonracemic β- and γ-amino ethers has been developed. The reaction mainly proceeds via an SN2 pathway, and the partial racemization of the starting substrate was effectively controlled by using quaternary ammonium salts. β- and γ-amino ethers are obtained
已经开发了路易斯酸催化的季铵盐介导的手性活化氮丙啶和氮杂环丁烷与醇的非区域性β-和γ-氨基醚的高度区域选择性开环。该反应主要通过S N 2途径进行,并且通过使用季铵盐有效地控制了起始底物的部分消旋。以高对映体和非对映体特异性(ee最高> 99%,最高99%)获得β-和γ-氨基醚。当将卤代醇用作亲核试剂时,该方法进一步扩展为合成具有高对映体特异性的吗啉及其同系物(ee高达90%)。