The synthesis of (R)-γ-phenyl-γ-(trifluoromethyl)-butyrolactone and (2R,3S)-1,1,1-trifluoro-2-methoxy-2-phenyl-3,4-epoxybutane in homochiral forms.
摘要:
(R)-gamma-Phenyl-gamma-(trifluoromethyl)-butyrolactone (1) and (2R,3S)-1,1,1-trifluoro-2-methoxy-2-phenyl-3,4-epoxybutane (2) have been prepared in high optical purity from the tertiary (S)-(3)-acetate which was resolved using the lipase from Candida cylindracea.
A gene coding for an esterase (EstEH112) was isolated from metagenome originated from Korean intertidal flat sediment. The putative esterase gene encoded a 340 amino acids protein with characteristic residues of lipolytic enzymes such as a conserved pentapeptide (GXSXG), the typical catalytic S-D-H triad, and a GGG(A)X-motif in the oxyanion hole near the active site similar to the hormone sensitive lipase (HSL) family. p-Nitrophenyl butyrate was the best substrate for the enzyme among the other p-nitrophenyl esters investigated. The apparent optimal temperature and pH for EstEH112 was 35 C and at pH 8.0, respectively. EstEH112 efficiently catalyzed the hydrolysis of various large tertiary alcohol esters. These characteristics of EstEH112 make it a potential candidate for application in biocatalysis. (C) 2012 Elsevier B.V. All rights reserved.