摘要:
4-(Indol-3-ylmethyl)-4-hydroxy-2-oxoglutarate, which is useful as an intermediate in the synthesis of monatin, may be synthesized from indole pyruvic acid and pyruvic acid (and/or oxaloacetic acid) by using a novel aldolase derived from the genus Pseudomonas, Erwinia, Flavobacterium, or Xanthomonas.
摘要:
The present invention relates to a process for producing efficiently glutamic acid derivatives (including salts thereof) such as monatin by converting a substituted α-keto acid of formula (1) into a glutamic acid derivative of formula (2) in the presence of an enzyme catalyzing conversion of the same.
摘要:
The present invention relates to a process for producing efficiently glutamic acid derivatives (including salts thereof) such as monatin by converting a substituted α-keto acid of formula (1) into a glutamic acid derivative of formula (2) in the presence of an enzyme catalyzing conversion of the same.
摘要:
The present invention relates to a process for producing efficiently glutamic acid derivatives (including salts thereof) such as monatin by converting a substituted α-keto acid of formula (1) into a glutamic acid derivative of formula (2) in the presence of an enzyme catalyzing conversion of the same.
摘要:
The present invention provides a process for selectively producing an enantiomer at position 4 of an optically active compound in the cross aldol reaction of pyruvic acid and indole-3-pyruvic acid. The process comprises the step of reacting pyruvic acid with indole-3-pyruvic acid in the presence of an optically active α-amino acid containing a secondary amine and a metal ion.
摘要:
The present invention relates to processes of producing glutamic acid compounds, for example, monatin, which are useful as, for example, production intermediates for sweetener or pharmaceutical products.
摘要:
Dihydroisoxazole derivatives are conveniently converted to γ-hydroxyamino acid derivatives which are important as various synthetic intermediates by a catalytic hydrogenation reaction. High-purity monatins which may be used as sweeteners or ingredients thereof can be obtained by subjecting a 5-indolylmethyl-4,5-dihydroisoxazole-3,5-dicarboxylic acid to catalytic hydrogenation.
摘要:
N-[N-[3-(phenyl having various substituent group(s) on the benzene ring)propyl]-L-&agr;-aspartyl]-L-phenylalanine 1-methyl ester derivatives, which are useful as sweeteners, may be conveniently produced on an industrial scale at a high yield by reductively alkylating aspartame with a 3-(phenyl having specified substituent group(s) on the benzene ring)-2-propenyl aldehyde and hydrogen in the presence of a catalyst and a base.
摘要:
There is provided a thermoplastic polymer composition containing (i) 100 parts of a block copolymer comprising an aromatic vinyl block and a conjugated diene block, (ii) 5 to 200 parts of a polyurethane block copolymer having a thermoplastic polyurethane block, (iii) 10 to 300 parts of a thermoplastic polyurethane and (iv) 10 to 300 parts of a paraffin oil.
摘要:
To provide a substrate material having characteristics suitable to a magnetic head for attaining high recording density. A substrate material for a magnetic head comprising a matrix phase of a carbide of one or more of Ti, W and Ta and a dispersion phase of an oxide of one or more of Al.sub.2 O.sub.3, CrO.sub.3, and ZrO.sub.2, in which the material comprises 60 to 95 vol % of the matrix phase of the carbide. Further, a single phase in which the ingredients of carbides as the matrix phase comprise (Ti.sub.j W.sub.m Ta.sub.n)C.sub.x is preferred. Further, oxygen and/or nitrogen may be solid-solubilized in the carbide MeC of the matrix phase wherein Me is one or more of Ti, W, and Ta.