Synthesis of chiral hydantoin derivatives by homogeneous Pd-catalyzed asymmetric hydrogenation
作者:Bao-De Ma、Sheng-Hua Du、Yu Wang、Xiao-Ming Ou、Ming-Zhi Huang、Li-Xin Wang、Xiao-Guang Wang
DOI:10.1016/j.tetasy.2016.10.006
日期:2017.1
5-Aryl substituted chiral hydantoin derivatives were synthesized via asymmetric hydrogenation of prochiral exocyclic alkenes using a Pd/BINAP catalyst. Moderate to good enantioselectivity were obtained (21-90% ee). A chiral Bronsted acid additive was found to be a key factor to obtain high enantioselectivity. (C) 2016 Elsevier Ltd. All rights reserved.
Enantioselective Synthesis of Chiral Substituted 2,4-Diketoimidazolidines and 2,5-Diketopiperazines via Asymmetric Hydrogenation
An enantioselective hydrogenation of 5-alkylidene-2,4-diketoimidazolidines (hydantoins) and 3-alkylidene-2,5-ketopiperazines catalyzed by the Rh/f-spiroPhos complex under mild conditions has been developed, which provides an efficientapproach to the highly enantioselective synthesis of chiral hydantoins and 2,5-ketopiperazine derivatives with high enantioselectivities up to 99.9% ee.
已经开发了在温和条件下由 Rh/ f -spiroPhos 络合物催化的 5-亚烷基-2,4-二酮咪唑烷(乙内酰脲)和 3-亚烷基-2,5-酮哌嗪的对映选择性氢化,这提供了一种高效的方法。手性乙内酰脲和 2,5-酮哌嗪衍生物的对映选择性合成,对映选择性高达 99.9% ee。