A new (R)-hydroxynitrile lyase from Prunus mume: asymmetric synthesis of cyanohydrins
作者:Samik Nanda、Yasuo Kato、Yasuhisa Asano
DOI:10.1016/j.tet.2005.08.105
日期:2005.11
A new hydroxynitrile lyase (HNL) was isolated from the seed of Japanese apricot (Prunus mume). The enzyme has similar properties with HNL isolated from other Prunus species and is FAD containing enzyme. It accepts a large number of unnatural substrates (benzaldehyde and its variant) for the addition of HCN to produce the corresponding cyanohydrins in excellent optical and chemical yields. A new HPLC
The present invention relates to:
a method for producing &agr;-hydroxycarboxylic acid, which comprises hydrolyzing cyanohydrin in the presence of a hydrocarbon solvent;
a method for producing optically active &agr;-hydroxycarboxylic acid, which comprises: producing optically active cyanohydrin by performing a reaction between a carbonyl compound and hydrogen cyanide, using a solvent comprising at least one organic solvent selected from a group consisting of an alcoholic solvent, an ester solvent, an ethereal solvent and a carboxylic solvent; removing said organic solvent from said reaction solvent; and hydrolyzing the remaining reaction mixture without isolating optically active cyanohydrin;
a method for producing optically active &agr;-hydroxycarboxylic acid, which comprises hydrolyzing optically active cyanohydrin, using at most 10 equivalents of mineral acid relative to said optically active cyanohydrin under the condition that maximum temperature when reacting is 90° C. or less; and
a method for producing optically active crystalline &agr;-hydroxycarboxylic acid, which comprises crystallizing optically active &agr;-hydroxycarboxylic acid in an aqueous solution.
Approach to(R)- and (S)-ketone cyanohydrins using almond and apple meal as the source of (R)-oxynitrilase
作者:Eero Kiljunen、Liisa T. Kanerva
DOI:10.1016/s0957-4166(97)00110-9
日期:1997.5
The synthesis of aliphatic and aromatic (R)-ketone cyanohydrins through the addition of hydrogen cyanide to the corresponding ketones and the synthesis of the (S)-enantiomers through the kinetic resolution of racemic ketone cyanohydrins has been studied in the presence of almond or apple meal. Substrate tolerance of the (R)-oxynitrilases towards ketones ((RRC)-R-1-C-2=O) is highly restricted compared to that of structurally similar aldehydes, reactivity following the order of H>Me much greater than Et for R-2. In the case of aromatic methyl ketones reactivity difference (C6H5 much greater than p-Me-C6H4 for R-1) is notable. (C) 1997 Elsevier Science Ltd.
TROYANSKIJ EH. I.; MIZINTSEV V. V.; MOLOKANOV A. N.; OGIBIN YU. N.; NIKIS+, IZV. AN CCCP. CEP. XIM.,(1986) N 12, 2725-2734
作者:TROYANSKIJ EH. I.、 MIZINTSEV V. V.、 MOLOKANOV A. N.、 OGIBIN YU. N.、 NIKIS+
DOI:——
日期:——
A method for producing alpha-hydroxycarboxylic acid