Copper(II)-Catalyzed Aminohydroxylation of Olefins
摘要:
We report a novel copper(II)-catalyzed aminohydroxylation in which both heteroatoms of an N-sulfonyl oxaziridine are added across an alkene in a regioselective fashion. A variety of styrenes and electron-rich alkenes can be aminohydroxylated using this protocol. Preliminary investigations indicate that this new process is a rare non-oxenoid reaction of N-sulfonyl oxaziridines, involving a stepwise, polar mechanism rather than a concerted process.
Oxaziridine-mediated enantioselective aminohydroxylation of styrenes catalyzed by copper(II) bis(oxazoline) complexes
作者:David J. Michaelis、Kevin S. Williamson、Tehshik P. Yoon
DOI:10.1016/j.tet.2009.03.012
日期:2009.6
oxaziridine-mediated enantioselective aminohydroxylation of olefins catalyzed by a chiral copper(II) bis(oxazoline) complex. A variety of styrenic olefins undergo efficient aminohydroxylation with excellent regioselectivity and synthetically useful levels of enantioselectivity (up to 84% ee). The reaction can be conducted on multi-gram scale with as little as 2 mol % of the copper(II) catalyst. Hydrolysis
我们报告了由手性铜 (II) 双 (恶唑啉) 配合物催化的恶氮丙啶介导的烯烃的对映选择性氨基羟基化。各种苯乙烯烯烃经过有效的氨基羟基化,具有出色的区域选择性和合成有用的对映选择性水平(高达 84% ee)。该反应可以在多克规模上进行,使用少至 2 mol% 的铜 (II) 催化剂。所得 1,3-恶唑啉在酸性条件下水解产生N-磺酰基氨基醇,可通过重结晶纯化以提供非常高水平的对映选择性。