Double Asymmetric Hydrogenation of Linear β,β-Disubstituted α,β-Unsaturated Ketones into γ-Substituted Secondary Alcohols using a Dual Catalytic System
β‐unsaturated ketones catalyzed by the DM‐SEGPHOS/DMAPEN/RuII complex with t‐C4H9OK afforded the γ‐substituted secondaryalcohols in high diastereo‐ and enantioselectivities. Some mechanistic experiments suggested that two different reactive species, type (I) and (II), were reversibly formed in this catalytic system: Type (I) with the diamine ligand DMAPEN enantioselectively hydrogenated the enones
1-Aryl-1-lower alkyl-1-buten-3-ols and ester derivatives
申请人:Sandoz, Inc.
公开号:US04081476A1
公开(公告)日:1978-03-28
The compounds are 1-aryl-1-lower alkyl-substituted-1-buten-3-ols, butan-3-ols, and acylation products thereof, e.g., (p-biphenylyl)-2-penten-4-ol and are useful as pharmaceuticals.