Enantioselective addition of dimethylzinc to aldehydes: assessment of optimal N,N-substitution for 2-dialkylamino-1,1,2-triphenylethanol ligands
摘要:
A general methodology for the synthesis of 2-dialkylamino-1,1,2-triphenylethanol has been developed. Novel ligands 3, 4, and 5, bearing flexible alkyl chains on nitrogen have been synthesized by epoxide-ring opening of the encumbered (S)-triphenyloxirane. These ligands along with 2-piperidino-1,1,2-triphenyl ethanol 1 have been tested in the addition of dimethylzinc to aldehydes. This allowed for the assessment of the structural features that favor the catalytic activity and selectivity of the ligands with respect to nitrogen substitution. (C) 2004 Elsevier Ltd. All rights reserved.
2-triphenylethanols (4a-d). These amino alcohols catalytically induce the addition of diethylzinc to benzaldehyde with high enantioselectivity at 0 degrees C and at room temperature. Ligand 4a, which provides the highest enantioselectivity at 0 degrees C, has been studied in the addition of Et(2)Zn to a family of 20 representative aliphatic and aromatic aldehydes 5a-t. For a 17-membered set of alpha-substituted
[EN] PROCESS FOR THE PREPARATION OF CARBOPROST AND ITS TROMETHAMINE SALT<br/>[FR] PROCÉDÉ PERMETTANT LA PRÉPARATION DE CARBOPROST ET DE SON SEL DE TROMÉTHAMINE
申请人:CHINOIN GYÓGYSZER ÉS VEGYÉSZETI TERMÉKEK GYÁRA ZRT
公开号:WO2017093770A1
公开(公告)日:2017-06-08
The subject of the invention is a novel process for the preparation of Carboprost tromethamine salt where alkylation the enone of the general formula (II) is carried out in the presence of a chiral auxiliary in aprotic solvent with a Grignard reagent. The methyl ester epimers of formula (VII) are separated by gravity silicagel chromatography and the salt formation is carried out by using solid tromethamine base.
This application relates to a substituted hydroxyphenyl ketone compound of formula I, or a pharmaceutically acceptable salt thereof, a pharmaceutical composition thereof and its use in treating migraine.
This application also relates to processes for preparing a compound of formula I, and intermediate compounds useful therein.
The present invention provides compounds of formula I:
pharmaceutical compositions thereof, and methods of using the same, processes or preparing the same, and intermediates thereof.
本发明提供了式 I 的化合物:
其药物组合物、使用方法、制备方法及其中间体。
Process for the preparation of carboprost and its tromethamine salt
申请人:CHINOIN GYÓGYSZER ÉS VEGYÉSZETI TERMÉKEK GYÁRA ZRT.
公开号:US10442762B2
公开(公告)日:2019-10-15
The subject of the invention is a novel process for the preparation of Carboprost tromethamine salt where alkylation the enone of the general formula (II) is carried out in the presence of a chiral auxiliary in aprotic solvent with a Grignard reagent. The methyl ester epimers of formula (VII) are separated by gravity silica gel chromatography and the salt formation is carried out by using solid tromethamine base.