152786-27-1Relevant articles and documents
A new member of the 4-methylideneimidazole-5-one-containing aminomutase family from the enediyne kedarcidin biosynthetic pathway
Huang, Sheng-Xiong,Lohman, Jeremy R.,Huang, Tingting,Shen, Ben
, p. 8069 - 8074 (2013)
4-Methylideneimidazole-5-one (MIO)-containing aminomutases catalyze the conversion of L-a-amino acids to β-amino acids with either an (R) or an (S) configuration. L-Phenylalanine and L-tyrosine are the only two natural substrates identified to date. The enediyne chromophore of the chromoprotein antitumor antibiotic kedarcidin (KED) harbors an (R)-2-aza-3-chloro-β- tyrosine moiety reminiscent of the (S)-3-chloro-5-hydroxy-β-tyrosine moiety of the C-1027 enediyne chromophore, the biosynthesis of which uncovered the first known MIO-containing aminomutase, SgcC4. Comparative analysis of the KED and C-1027 biosynthetic gene clusters inspired the proposal for (R)-2-aza-3-chloro-β-tyrosine biosynthesis starting from 2-aza-L-tyrosine, featuring KedY4 as a putative MIO-containing aminomutase. Here we report the biochemical characterization of KedY4, confirming its proposed role in KED biosynthesis. KedY4 is anMIO-containing aminomutase that stereospecifically catalyzes the conversion of 2-aza-L-tyrosine to (R)-2-aza-β-tyrosine, exhibiting no detectable activity toward 2-aza-L-phenylalanine or L-tyrosine as an alternative substrate. In contrast, SgcC4, which stereospecifically catalyzes the conversion of L-tyrosine to (S)-β-tyrosine in C-1027 biosynthesis, exhibits minimal activity with 2-aza-L-tyrosine as an alternative substrate but generating (S)-2-aza-β-tyrosine, a product with the opposite stereochemistry of KedY4. This report of KedY4 broadens the scope of known substrates for the MIO-containing aminomutase family, and comparative studies of KedY4 and SgcC4 provide an outstanding opportunity to examine how MIO-containing aminomutases control substrate specificity and product enantioselectivity.
Resolution synthesis method of 3-amino-3-(4-hydroxyphenyl)propionic acid
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, (2018/03/28)
The invention relates to a resolution synthesis method of 3-amino-3-(4-hydroxyphenyl)propionic acid, mainly aiming at solving the technical problems of an existing synthesis method of more steps and high cost. The resolution synthesis method comprises the following steps: enabling p-hydroxybenzaldehyde to react with ammonium acetate and malonic acid in an ethanol solution to generate a compound 1; enabling the compound 1 to react with triethylamine and di-tert-butyl dicarbonate in a mixed solution of water and acetone to generate a compound 2; enabling the compound 2 to react with R(+)-1-phenethylamine in a tetrahydrofuran solution; acidifying an intermediate product with hydrochloric acid to generate a compound 3; enabling the compound 3 to react with an ethanol solution of hydrochloric acid to obtain hydrochloride, and enabling the hydrochloride to react with a sodium hydroxide water solution to obtain a target compound 4; enabling the compound 2 to react with S-1-phenethylamine in the tetrahydrofuran solution, and acidifying an intermediate product with the hydrochloric acid to generate a compound 5; enabling the compound 5 to react with the ethanol solution of the hydrochloric acid to obtain hydrochloride and enabling the hydrochloride to react with a sodium hydroxide water solution to obtain a target compound 6. (R)- and (S)-3-amino-3-(4-hydroxyphenyl)propionic acid is widely applied in a polypeptide biopharmaceutical industry.
Homochiral lithium amides for the asymmetric synthesis of β-amino acids
Davies, Stephen G.,Garrido, Narciso M.,Kruchinin, Dennis,Ichihara, Osamu,Kotchie, Luke J.,Price, Paul D.,Mortimer, Anne J. Price,Russell, Angela J.,Smith, Andrew D.
, p. 1793 - 1811 (2007/10/03)
Secondary homochiral lithium amides derived from α-methylbenzylamine undergo highly diastereoselective conjugate additions to a range of α,β-unsaturated esters. The corresponding β-amino acids are readily liberated by successive N-debenzylation and ester hydrolysis, furnishing (R)-β-amino butyric acid, (R)-β-amino pentanoic acid, (S)-β-leucine, (R)-β-amino octanoic acid, (S)-β-phenylalanine, (S)-β-tyrosine methyl ether, (S)-β-tyrosine hydrochloride and (S)-β-(2-methoxyphenyl)-β-amino propanoic acid in high yields and high ee. The application of this procedure to the synthesis of the natural products (R)-β-DOPA and (R)-β-lysine is demonstrated. The development of a simplified one-pot reaction protocol applicable to the multi-gram scale synthesis of homochiral β-amino esters is also delineated.
