Chemoenzymatic Synthesis of Glutamic Acid Analogues: Substrate Specificity and Synthetic Applications of Branched Chain Aminotransferase from Escherichia coli
摘要:
[GRAPHICS]A new route to alpha-keto acids is described, based on the ozonolysis of enol acetates obtained from alpha-substituted beta-keto esters. Escherichia coli branched chain aminotransferase (BCAT) activity toward a variety of substituted 2-oxoglutaric acids was demonstrated analytically. BCAT was shown to have a broad substrate spectrum, complementary to that of aspartate aminotransferase, and to offer access to a variety of glutamic acid analogues. The usefulness of BCAT was demonstrated through the synthesis of several 3- and 4-substituted derivatives.
Asymmetric Synthesis of α-Keto Esters via Cu(II)-Catalyzed Aerobic Deacylation of Acetoacetate Alkylation Products: An Unusually Simple Synthetic Equivalent to the Glyoxylate Anion Synthon
作者:Kimberly M. Steward、Jeffrey S. Johnson
DOI:10.1021/ol200649u
日期:2011.5.6
alpha-keto esters is described using a copper(II)-catalyzed aerobic deacylation of substituted acetoacetate esters. The substrates for the title process arise from catalytic, enantioselectiveconjugateadditions and alkylation reactions of acetoacetate esters. The mild conditions do not induce racemization of the incipient enolizable alpha-keto ester. The reaction is tolerant of esters, certain ketones