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%)。
Stereospecific Synthesis of 2-Iminothiazolidines via Domino Ring-Opening Cyclization of Activated Aziridines with Aryl- and Alkyl Isothiocyanates
作者:Aditya Bhattacharyya、C. V. Kavitha、Manas K. Ghorai
DOI:10.1021/acs.joc.6b01551
日期:2016.8.5
catalyzed domino ring-opening cyclization of activated aziridines with aryl and alkyl isothiocyanates has been accomplished leading to the formation of a wide variety of highly substituted and functionalized 2-iminothiazolidines with excellent diastereo- and enantiospecificity (de, ee up to >99%). The reaction proceeds via a Lewis acid catalyzed SN2-type ring-opening of the activated aziridine followed by
用芳基和异硫氰酸烷基酯完成路易斯酸催化活化氮丙啶的多米诺环的开环反应,导致形成各种具有高度非对映体和对映体特异性的高取代和官能化的2-亚氨基噻唑烷(de,ee可达> 99% )。反应是通过路易斯酸催化的活化氮丙啶的S N 2型开环进行的,然后以多米诺方式同时进行5- exo-dig环化反应,以极高的收率(高达99%)提供2-iminothiazolidine衍生物。 。
Enantioselective Syntheses of Morpholines and Their Homologues via S<sub>N</sub>2-Type Ring Opening of Aziridines and Azetidines with Haloalcohols
作者:Manas K. Ghorai、Dipti Shukla、Kalpataru Das
DOI:10.1021/jo901297d
日期:2009.9.18
yield and enantioselectivity of a variety of substituted nonracemic morpholines and their homologues is described. The reaction proceeds via an SN2-type ring opening of activated aziridines and azetidines by suitable halogenated alcohols in the presence of Lewis acid followed by base-mediated intramolecular ring closure of the resulting haloalkoxy amine.
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%)。