Kinetic resolution of aliphatic acyclic β-hydroxyketones by recombinant whole-cell Baeyer–Villiger monooxygenases—Formation of enantiocomplementary regioisomeric esters
作者:Jessica Rehdorf、Alenka Lengar、Uwe T. Bornscheuer、Marko D. Mihovilovic
DOI:10.1016/j.bmcl.2009.05.014
日期:2009.7
substrates in the enzymatic kinetic and regioselective Baeyer–Villiger oxidation catalyzed by 12 Baeyer–Villigermonooxygenases from different bacterial origin. Excellent enantioselectivities (E >100) could be observed with 4-hydroxy-2-ketones. After acyl migration, the ester undergoes hydrolysis followed by the formation of optically active 1,2-diols. Furthermore, resolution of 5-hydroxy-3-ketones gave
Fragrance and flavor compositions and fragrance- and flavor-added products
申请人:TAKASAGO INTERNATIONAL CORPORATION
公开号:US20030092599A1
公开(公告)日:2003-05-15
Ketone compounds having marine-like, modern green-like and fatty green-like fragrance and flavor, and fragrance compositions and flavor compositions containing the same. A fragrance or flavor composition which contains one or more of ketone compounds represented by the following general formula (1)
1
(wherein A is C═O or CH—OH, R
1
is hydrogen atom or methyl group and R
2
is methyl group or ethyl group, with the proviso that R
2
is ethyl group when R
1
is hydrogen atom, and R
2
is methyl group when R
1
is methyl group) as the aromatic component.