A facile enzymatic resolution process for the preparation of (+)--2-(6-hethoxy-2-naphthyl)propionic acid (Naproxen).
作者:Qu-Ming Gu、Ching-Shin Chen、C.J Sih
DOI:10.1016/s0040-4039(00)84368-3
日期:1986.1
(+)--2-(6-Methoxy-2-naphthyl)propionic acid () has been prepared via enzymatic enantlospecific hydrolysis of(±)-chloroethyl-2-(6-methoxy-2-naphthyl) propionate (), catalyzed by the lipase of Candidacylindracea.
Process for preparing (S)-alpha-methylarylacetic acids
申请人:WISCONSIN ALUMNI RESEARCH FOUNDATION
公开号:EP0227078A1
公开(公告)日:1987-07-01
The invention relates to a process for preparing (S)-alpha-methylarylacetic acids from mixtures, such as racemic mixtures, of (R)-and (S)-alpha-methylarylacetic acid esters by enantiospecific hydrolysis using extracellular lipases of microbial origin (EC 3.1.1.3). Preferably S-2-(6-methoxy-2-naphthyl)-alpha-methylacetic acid is prepared (S-Naproxen).
作者:Surrinder Koul、Rajinder Parshad、Subhash C. Taneja、Ghulam N. Qazi
DOI:10.1016/s0957-4166(03)00492-0
日期:2003.8
Trichosporon sp. (TSL), a newly found strain isolated from a locally fermented cottage cheese has been found to be highly stereoselective in the resolution of (S)-(+)-naproxen (ee >99%, Esimilar to500) from the corresponding racemic methyl ester. The process of resolution using whole cells has been scaled up to multi-kg level. Optimization of experimental conditions including downstream processing at 80-100 g/L substrate concentration with >90% recovery has been achieved. Changes in the physical parameters such as the particle size of the substrate play an important role in the resolution kinetics. A new strain of Trichosporon sp. having high cell density in cultivation (>60 g dry cell mass L-1 in 14-16 h) is found to be sufficiently stable for two years in dry powder form at 5-8degreesC. The viability of the resolution process has been further improved by the development of a simple racemization process for the enriched (R)-(-)-ester. (C) 2003 Elsevier Ltd. All rights reserved.