Enzymatic kinetic resolution of hydroxystearic acids: A combined experimental and molecular modelling investigation
摘要:
Enantioenriched 7-, 8-, 9-, and 10-hydroxystearic acids (HSA) were obtained, for the first time, by kinetic resolution of their racemates with lipases CALB and PS, in the presence of vinyl acetate. Among them, the best results were obtained for 7-HSA and 9-HSA, whose enantiomeric excess was around 55%. The same resolutions carried out on the hydroxy esters completely failed. For the acid substrates neither the Kazlauskas' rule nor the 3D-QSAR model could be applied, since both models are focused on the CALB alcohol-pocket evaluation and not on the acyl-pocket one. Therefore, a semiquantitative approach was used, whose results were in accordance with our findings, as far as the absolute configuration of the product is concerned. (C) 2012 Elsevier B.V. All rights reserved.
An Easy Route to Enantiomerically Enriched 7- and 8-Hydroxystearic Acids by Olefin-Metathesis-Based Approach
作者:Patrizia Nitti、Carla Boga、Sara Drioli、Cristina Forzato、Gabriele Micheletti、Fabio Prati
DOI:10.1055/s-0035-1561570
日期:——
The synthesis of enantiomerically enriched 7- and 8-hydroxystearic acids (7- and 8-HSA) has been successfully accomplished starting from chiral nonracemic 1-pentadecen-4-ol and 1-tetradecen-4-ol, respectively. Their Yamaguchi’s esterification with 4-pentenoic and 5-hexenoic acids, respectively, afforded the suitable dienic esters which were submitted to ring-closing metathesis reaction. After hydrogenation