Highly Diastereoselective Addition of Grignard Reagents to Aliphatic, Enolizable N-Alkylketimines and 2,2-Disubstituted 1,3-Oxazolidines. Asymmetric Synthesis of the Antidepressant Cericlamine
摘要:
Grignard reagents were added to 2,2-disubstituted 1,3-oxazolidines and enolizable ketimines prepared from hydroxyacetone and phenylglycinol derivatives, with high to excellent diastereoselectivity, to yield 2,2-disubstituted 1,2-amino alcohol derivatives. Lewis acids had considerable influence on the yield and diastereoselectivity of the addition. This method was applied to the first asymmetric synthesis of the 5-HT reuptake inhibitor Cericlamine.
On the Origin of Asymmetric Induction of the Palladium-Catalyzed Allylic Substitution Reaction with Chiral 4,4-Disubstituted 4,5-Dihydro-2-(phosphinoaryl)oxazole Ligands
作者:Silvia Schaffner、Jürgen F. K. Müller、Markus Neuburger、Margareta Zehnder
DOI:10.1002/hlca.19980810533
日期:——
4-monosubstituted 4,5-dihydro-2-(phosphinoaryl)oxazoleligand 1a reveals important structural differences (Fig. 3). 1H-NMR Spectroscopic investigation confirm that the 4,4-disubstituted4,5-dihydro-2-(phosphinoaryl)oxazoleligand 4 of 5 and 6 shows the same conformation in solution as in the solid state (Table 2). The application of ligand (S)-4 in the Pd-catalyzed allylicsubstitution demonstrates a
Chiral azo compounds: enantioselective synthesis and transformations into β-amino alcohols and α-amino acids with a quaternary stereocenter
作者:Friedrich R. Dietz、Agnes Prechter、Harald Gröger、Markus R. Heinrich
DOI:10.1016/j.tetlet.2010.11.137
日期:2011.2
Taking advantage of radical carboaminations producing azo compounds, a new chemo-enzymatic approach to enantiomerically enriched azo alcohols, beta-amino alcohols and non-natural (aromatic) amino acids with a quaternary stereocenter is reported. (C) 2010 Elsevier Ltd. All rights reserved.
[EN] BENZOXAZINE DERIVATIVES AND THEIR THERAPEUTIC USE<br/>[FR] DERIVES DE BENZOXAZINES, LEUR PROCEDE DE PREPARATION ET LEUR UTILISATION EN THERAPEUTIQUE
申请人:AVENTIS PHARMA SA
公开号:WO2001009127A1
公开(公告)日:2001-02-08
La présente invention concerne de nouveaux dérivés de 8-carbonyl benzoxazine, qui inhibent la farnésyle transférase. La présente invention concerne également leur procédé de préparation et leur utilisation en tant qu'agent thérapeutique.