Stereoselective Synthesis of Chiral 2,3-<i>cis</i>-2-Ethynylaziridines by Base-Mediated Intramolecular Amination of Bromoallenes
作者:Hiroaki Ohno、Hisao Hamaguchi、Tetsuaki Tanaka
DOI:10.1021/ol016027k
日期:2001.7.1
[reaction: see text] Novel stereoselective synthesis of 2,3-cis-2-ethynylaziridines from amino allenes is presented. While sodium hydride mediated intramolecular amination of (4S,aS)-4-alkyl-4-[N-(arylsulfonyl)amino]-1-bromobuta-1,2-dienes yields a mixture of 2,3-cis- and 2,3-trans-2-ethynylaziridines in which the cis-isomer predominates (79:21-89:11), the amination of (4S,aR)-isomers affords 2,3-cis-aziridines
[反应:见正文]提出了一种新的立体选择性合成方法,由氨基丙二烯合成2,3-顺-2-乙炔基氮丙啶。氢化钠介导的(4S,aS)-4-烷基-4- [N-(芳基磺酰基)氨基] -1-溴丁烯-1,2-二烯的分子内胺化反应生成2,3-顺式和2, 3-反式-2-乙炔基氮丙啶类化合物,其中顺式异构体占主导地位(79:21-89:11),(4S,aR)异构体的胺化反应可提供具有优异选择性的2,3-顺式氮丙啶类化合物(91:9- 100:0)。还描述了通过一系列反应(甲磺酸介导的开环反应,溴化和叠氮化)将2,3-反式-2-乙炔基氮丙啶转化成相应的顺式异构体。