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%)。
Antifungal agents
申请人:Greenlee Mark L.
公开号:US20100113439A1
公开(公告)日:2010-05-06
Novel derivatives of enfumafungin are disclosed herein, along with their pharmaceutically acceptable salts, hydrates and prodrugs. Also disclosed are compositions comprising such compounds, methods of preparing such compounds and methods of using such compounds as antifungal agents and/or inhibitors of (1,3)-β-D-glucan synthase. The disclosed compounds, their pharmaceutically acceptable salts, hydrates and prodrugs, as well as compositions comprising such compounds, salts, hydrates and prodrugs, are useful for treating and/or preventing fungal infections and associated diseases and conditions.
Novel derivatives of enfumafungin are disclosed herein, along with' their pharmaceutically acceptable salts, hydrates and prodrugs. Also disclosed are compositions comprising such compounds, methods of preparing such compounds and method of using such compounds as antifungal agents and/or inhibitors of (1,3)-β-D-glucan synthase. The disclosed compounds, their pharmaceutically acceptable salts, hydrates and prodrugs, as well as compositions comprising such compounds, salts, hydrates and prodrugs, are useful for treating and/or preventing fungal infections and associated diseases and conditions.
Stereoselective Synthesis of 2,6-<i>cis</i>- and 2,6-<i>trans</i>-Piperidines through Organocatalytic Aza-Michael Reactions: A Facile Synthesis of (+)-Myrtine and (−)-Epimyrtine
作者:Yongcheng Ying、Hyoungsu Kim、Jiyong Hong
DOI:10.1021/ol103064f
日期:2011.2.18
Both 2,6-cis- and 2,6-trans-piperidines were prepared from common substrates through organocatalytic aza-Michael reactions promoted by the gem-disubstituent effect in conjunction with dithiane coupling reactions. The organocatalytic aza-Michael reaction enabled a facile synthesis of (+)-myrtine and (-)-epimyrtine from a common substrate.