(Z)-2-N-Acylamino-3-pyridyl-acrylic acids and their esters were prepared by partially known procedures and hydrogenated in the presence of HBF4 to the corresponding optically active 2-N-acetyl-(or benzoyl-)-3-(3- or 4-pyridyl)-alanines or analogous methyl esters with enantiomeric excesses up to 90%. The rhodium complexes of PROPRAPHOS, 6a,b, or of O,N-bis(diphenylphosphino)-2-exo-hydroxy, 3-endo-methylamino-norbor-nane
Practical Enantioselective Hydrogenation of α-Aryl- and α-Carboxyamidoethylenes by Rhodium(I)-{1,2-Bis[(<i>o</i>-<i>tert</i>-butoxyphenyl)(phenyl)phosphino]ethane}
作者:Barbara Mohar、Michel Stephan
DOI:10.1002/adsc.201200780
日期:——
The rhodium(I)-1,2-bis[(o-tert-butoxyphenyl)(phenyl)phosphino]ethane} [Rh(I)-(t-Bu-SMS-Phos)] catalyst system displayed prime efficiency in the hydrogenation of large series of α-amidostyrenes and α-amidoacrylates. Up to >99.9% enantiomeric excesses coupled with very high reaction rates were attained operating routinely under 1–10 bar of hydrogen at 22 °C in methanol. Examples include industrial substrates
SYNTHESIS METHOD FOR L-HETEROCYCLIC AMINO ACID AND PHARMACEUTICAL COMPOSITION HAVING THEREOF
申请人:ASYMCHEM LABORATORIES (TIANJIN) CO., LTD
公开号:US20160153015A1
公开(公告)日:2016-06-02
A synthesis method for an L-heterocyclic amino acid and a pharmaceutical composition having the said amino acid are provided in the present disclosure. The synthesis method comprises: step A: preparing a heterocyclic keto acid, wherein the heterocycle in the heterocyclic keto acid is selected from any one of a five-membered heterocycle, a six-membered heterocycle, a seven-membered heterocycle, an alkyl-substituted five-membered heterocycle, an alkyl-substituted six-membered heterocycle, and an alkyl-substituted seven-membered heterocycle, and the keto acid group in the heterocyclic keto acid has a structural formula of
and is located on any one of the carbon positions of the heterocycle, and step B: mixing the heterocyclic keto acid with ammonium formate, a phenylalanine dehydrogenase, a formate dehydrogenase and a coenzyme NAD
+
, and carrying out a reductive amination reaction to generate L-heterocyclic amino acid, wherein the amino acid sequence of the phenylalanine dehydrogenase is SEQ ID No. 1.
本公开提供了一种L-杂环氨基酸的合成方法和具有该氨基酸的制药组合物。该合成方法包括:步骤A:制备杂环酮酸,其中杂环在杂环酮酸中选自五元杂环、六元杂环、七元杂环、烷基取代的五元杂环、烷基取代的六元杂环和烷基取代的七元杂环,而杂环酮酸中的酮酸基具有结构式,位于杂环的任一碳位上;步骤B:将杂环酮酸与甲酸铵、苯丙氨酸脱氢酶、甲酸脱氢酶和辅酶NAD+混合,并进行还原胺化反应以生成L-杂环氨基酸,其中苯丙氨酸脱氢酶的氨基酸序列为SEQ ID No. 1。
Structural investigation of (Z)-N-acetyl-?(3?-pyridyl)-dehydroalanine methyl ester
作者:V. Busetti、J. A. Mayoral、C. Cativiela、D. Aj�、M. Casarin
DOI:10.1007/bf01171026
日期:1988.2
Synthesis and Antimycobacterial Activity of 2,1′-Dihydropyridomycins
作者:Oliver P. Horlacher、Ruben C. Hartkoorn、Stewart T. Cole、Karl-Heinz Altmann
DOI:10.1021/ml300385q
日期:2013.2.14
Dihydropyridomycins 2 and 3, which lack the characteristic enol ester moiety of the potent antimycobacterial natural product pyridomycin (1), have been prepared from L-Thr, R- and S-hydroxy isovaleric acid, and 3-pyridinecarboxaldehyde. The 2R isomer 2 shows only 4-fold lower anti-Mtb activity than 1, indicating that the enol ester moiety in the natural product is not critical for its biological activity. This finding establishes 2 as a potent and more practical lead for anti-TB drug discovery.