Practical Synthesis of Optically Active α,α-Disubstituted Malonamic Acids through Asymmetric Hydrolysis of Malonamide Derivatives with Rhodococcus sp. CGMCC 0497
摘要:
A variety of alpha,alpha-disubstituted malonamides undergo enantioselective hydrolysis with Rhodococcus sp. CGMCC 0497 to give challenging enantiopure alpha,alpha-disubstituted malonamic acids with up to >99% enantiomeric excesses and 98% chemical yields. The enantioselectivity originated from the effects of a highly enantioselective amidase. The products could be converted to valuable (R)or (S)-alpha,alpha-dialkylated amino acids after routine conversions.
Asymmetric hydrolysis of a disubstituted malononitrile by the aid of a microorganism
摘要:
Rhodococcus rhodochrous ATCC 21197 hydrolyzed prochiral butylmethylmalononitrile to afford the corresponding amide-carboxylic acid with high enantiomeric excess. The reaction proceeds via the hydration of the starting dinitrile by a nitrile hydratase and the subsequent enantioselective hydrolysis of the intermediate diamide by an amidase.