Highlyenantioselective hydrogenation of seven-membered cyclic imines, substituted dibenzo[b,f][1,4]oxazepines, was achieved, with up to 94% ee, by using the [Ir(COD)Cl](2)/(S)-Xyl-C(3)*-TunePhos complex as the catalyst in the presence of morpholine-HCl.
catalyze the enantioselectivehydrogenation of diverse seven‐membered C=N‐containing heterocyclic compounds (eleven examples; up to 97 % ee). The P‐OP ligand L3, which incorporates an ortho‐diphenyl substituted octahydrobinol phosphite fragment, provided the highest enantioselectivities in the hydrogenation of most of the heterocyclic compounds studied. The observed stereoselection was rationalized by means
Palladium-catalyzed asymmetric hydrogenation of dibenzo[b,f][1,4]thiazepines activated by Brønsted acid
作者:Jinzhu Wang
DOI:10.1016/j.tetlet.2013.08.068
日期:2013.11
An efficient and facile route to chiral dihydrodibenzothiazepines has been successfully developed via palladium-catalyzedasymmetrichydrogenation of the dibenzothiazepines with Brønstedacid as activator with up to 94% ee.
A highly efficient asymmetrichydrogenation of azepine/oxazepine-type seven-member cyclic imine hydrochlorides was successfully developed using Rh/bisphosphine-thiourea ligand ZhaoPhos, affording various chiral seven-member cyclic amines with full conversions, high yields, and excellent enantioselectivities (up to 96% yield, >99% ee). Additionally, this asymmetrichydrogenation can proceed well on