Asymmetric Aminalization via Cation-Binding Catalysis
作者:Sang Yeon Park、Yidong Liu、Joong Suk Oh、Yoo Kyung Kweon、Yong Bok Jeong、Mengying Duan、Yu Tan、Ji-Woong Lee、Hailong Yan、Choong Eui Song
DOI:10.1002/chem.201703800
日期:2018.1.24
Asymmetric cation‐binding catalysis, in principle, can generate “chiral” anionic nucleophiles, where the counter cations are coordinated within chiral environments. Nitrogen nucleophiles are intrinsically basic, therefore, its use as nucleophiles is often challenging and limiting the scope of the reaction. Particularly, a formation of configurationally labile aminal centers with alkyl substituents
Highly functionalized glyco-conjugated hexahydroazepindiones from saccharide imides via the Norrish type II reaction
作者:Markus Stark、Joachim Thiem
DOI:10.1016/j.carres.2006.03.016
日期:2006.7
Starting from readily available protected 6-tosylates of D-glucose and D-mannose in both their pyranoside and furanoside forms as well as 6-tosylates of alpha-D-galactopyranose, the corresponding primary succinimido derivatives were obtained in good yield by nucleophilic displacement with potassium succinimide. These imido sugars were photochemically transformed into hexahydroazepindione derivatives such
Regioselectivity of the ring opening of propene oxides bearing electron-withdrawing substituents at the methyl group with Olah's reagent
作者:Rolf Skupin、Günter Haufe
DOI:10.1016/s0022-1139(98)00270-x
日期:1998.11
The regiochemistry of the hydrofluorination of terminal epoxides with Olah's reagent (Py·9HF) is dependent on the electron-withdrawing character of the β-substituents. Phenoxy ethers with different substitution patterns of the aromatic ring and several N-heterocycles were examined as β-substituents.
[EN] PROCESS FOR PREPARING INTERMEDIATES FOR THE SYNTHESIS OF OPTICALLY ACTIVE BETA-AMINO ALCOHOLS BY ENZYMATIC REDUCTION AND NOVEL SYNTHESIS INTERMEDIATES<br/>[FR] PROCÉDÉ DE PRÉPARATION D'INTERMÉDIAIRES POUR LA SYNTHÈSE D'ALCOOLS BÊTA-AMINO OPTIQUEMENT ACTIFS PAR RÉDUCTION ENZYMATIQUE ET NOUVEAUX INTERMÉDIAIRES DE SYNTHÈSE
申请人:OLON SPA
公开号:WO2019123311A1
公开(公告)日:2019-06-27
Subject-matter of the present invention is a process for preparing intermediates for the synthesis of optically active beta-amino alcohols by enzymatic reduction of the corresponding beta-amino ketones. Subject-matter of the invention are also said novel synthesis intermediates and the use thereof in the preparation of active pharmaceutical ingredients, among which vilanterol and the salts thereof.