Nitrile Biotransformations for the Efficient Synthesis of Highly Enantiopure 1-Arylaziridine-2-carboxylic Acid Derivatives and Their Stereoselective Ring-Opening Reactions
摘要:
Catalyzed by the Rhodococcus erythropolis AJ270 whole cell catalyst under very mild conditions, biotransformations of racemic 1-arylaziridine-2-carbonitriles proceeded efficiently and enantioselectively to produce highly enantiopure S-1-arylaziridine-2-carboxamides and R-1-arylaziridine-2-carboxylic acids in excellent yields. Although the nitrile hydratase exhibits no selectivity against all nitrile substrates, the amidase is highly R-enantioselective towards 1-arylaziridine-2-carboxamides. When treated with benzyl bromide, 1-phenylaziridine-2S-carboxamide underwent a highly regioselective and enantiospecific ring-opening reaction to afford an almost quantitative yield of R-beta-[(benzyl)phenylamino]-alpha-bromopropanamide (C-2 attack) and R-alpha-[(benzyl)phenylamino]-beta-bromopropanamide (C-3 attack) in a 10.5:1 ratio. Further treatment of the resulting ring-opening products with an N-nucleophilic reagent such as amine and azide led to, through most probably the aziridinium intermediate, the formation of S-alpha-substituted-beta-[(benzyl)phenylamino]propanamides in good chemical yields with high enantiomeric purity.
Engineered Biocatalytic Synthesis of β‐<i>N</i>‐Substituted‐α‐Amino Acids
作者:Jairo Villalona、Peyton M. Higgins、Andrew R. Buller
DOI:10.1002/anie.202311189
日期:2023.10.23
The β-subunit of tryptophan synthase was engineered for efficient N-alkylation to access densely functionalized non-canonical amino acids. Mechanistic analysis guided preparative scale synthesis, adding a valuable new enzyme to the biocatalytic toolbox.
Verbindungen der Formel (I) eignen sich zur Herstellung von Arzneimitteln zur Prophylaxe und Therapie von Erkrankungen, an deren Verlauf eine verstärkte Aktivität von NFkB beteiligt ist.