Journal
ACS CATALYSIS
Volume 10, Issue 15, Pages 8780-8787Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.0c02400
Keywords
imine reductase; intramolecular asymmetric reductive amination; chiral amine; 1,4-diazepane; Suvorexant
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Funding
- National Key R&D Program of China [2019YFA0905100]
- Youth Innovation Promotion Association of the Chinese Academy of Sciences [2016166]
- Tianjin Municipal Science and Technology Commission [15PTCYSY00020]
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An enzymatic intramolecular asymmetric reductive amination has been developed for the synthesis of chiral 1,4-diazepanes. Several enantiocomplementary IREDs were identified for the synthesis of (R)- and (S)-5-chloro-2-(5-methyl-1,4-diazepan-1-yl)benzo[d]oxazole with high enan- tioselectivity. The catalytic efficiency of (R)-selective IRED from Leishmania major (IR1) and (S)-selective IRED from Micromonospora echinaurantiaca IR25) was 0.027 and 0.962 s(-1) mM(-1), respectively. To further improve the catalytic efficiency of IR1, its double mutant Y194F/D232H was identified by saturation mutagenesis and iterative combinatorial mutagenesis, which exhibited 61-fold in the catalytic efficiency relative to that of wild-type enzyme. The density functional calculations and molecular dynamics simulations provided some insights into the molecular basis for the improved activity of mutant Y194F/D232H. Furthermore, Y194F/D232H and IR25 were applied to access a range of different substituted 1,4-diazepanes with high enantiomeric excess (from 93 to >99%). This study offers an effective method for construction of chiral 1,4-diazepanes of pharmaceutical importance via imine reductase-catalyzed intramolecular reductive amination of the corresponding aminoketones.
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