Asymmetric Synthesis of Protected Unnatural α-Amino Acids via Enantioconvergent Nickel-Catalyzed Cross-Coupling
作者:Ze-Peng Yang、Dylan J. Freas、Gregory C. Fu
DOI:10.1021/jacs.1c03903
日期:2021.6.16
enantioconvergent coupling of readily available racemic alkyl electrophiles with a wide variety of alkylzinc reagents (1:1.1 ratio) to afford protected unnatural α-amino acids in good yield and ee. This cross-coupling, which proceeds under mild conditions and is tolerant of air, moisture, and a broad array of functional groups, complements earlier approaches to the catalytic asymmetric synthesis of this valuable family
α-aminopimelic acids yield exclusively the ω-monoamide when they are subjected to amidation catalysed by the lipase B of Candida antarctica in anhydrous diisopropyl ether. These results are in contrast to the α-monoamide yielded by the equivalent L-glutamic derivatives under the same experimental conditions. These results show that the length of the side chain plays a crucial role in the regioselectivity of the