Asymmetric transfer of nitrenes catalyzed by chiral dirhodium(II) using aromatic sulfamate esters
作者:Corinne Fruit、Paul Müller
DOI:10.1016/j.tetasy.2004.01.015
日期:2004.3
insertions of aromatic sulfamate esters into activated C–H bonds have been achieved via in situ generated phenyliodinanes in the presence of PhI(OAc)2, MgO, and chiral Rh(II) catalysts. The optimal results were obtained with [Rh2(S)-nttl}4] and [Rh2(R)-ntv}4] as catalysts with up to 52% ee. In contrast, phenylsulfamates with allylic ortho-substituents reacted via intramolecular aziridination rather
通过在PhI(OAc)2,MgO和手性Rh(II)催化剂存在下原位生成的苯基碘丁烷,已将芳香族氨基磺酸酯的对映体内和分子间插入活化的C–H键中。使用[Rh 2 (S)-nttl} 4 ]和[Rh 2 (R)-ntv} 4 ]作为具有最多52%ee的催化剂获得了最佳结果。相比之下,具有烯丙基邻位取代基的苯氨基磺酸盐则通过分子内的叠氮化而不是通过插入反应。当反应与过量的氨基磺酸盐一起进行时,茚满的分子间酰胺化以高达97%的产率进行。