[EN] STEREOSELECTIVE REDUCTIVE AMINATION OF KETONES<br/>[FR] AMINATION REDUCTRICE STEREOSELECTIVE DE CETONES
申请人:BRISTOL MYERS SQUIBB CO
公开号:WO2000004179A1
公开(公告)日:2000-01-27
Processes for stereoselective enzymatic conversion of certain keto carboxylic acid derivatives to form the corresponding alkylamino acid compounds are described. The invention also concerns an engineered yeast host cell containing recombinant nucleic acid capable of expressing a phenylalanine dehydrogenase, as well as an engineered host cell containing recombinant nucleic acid capable of expressing a phenylalanine dehydrogenase enzyme and nucleic acid capable of expressing a formate dehydrogenase enzyme.
Nucleophilic Acyl Substitution via Aromatic Cation Activation of Carboxylic Acids: Rapid Generation of Acid Chlorides under Mild Conditions
作者:David J. Hardee、Lyudmila Kovalchuke、Tristan H. Lambert
DOI:10.1021/ja101292a
日期:2010.4.14
occurs rapidly in the presence of 3,3-dichlorocyclopropenes via the intermediacy of cyclopropenium carboxylate complexes. The effect of cyclopropene substituents on the rate of conversion is examined. The addition of tertiaryamine base is found to dramatically accelerate reaction, and conditions were developed for the preparation of acid sensitive acid chlorides. Preparative scale peptide couplings of
A Convenient Method for the Preparation of Acetal Carboxylic Acids by Nickel(II) Complex Catalyzed Oxygenation of α-Alkoxy Cyclic Ketones with Molecular Oxygen
In the presence of a catalytic amount of nickel(II) complex, various α-alkoxy cyclic ketones are smoothly oxygenated into acetal lactones by combined use of molecular oxygen and aldehydes at room temperature under an atmospheric pressure. Successive treatment of formed acetal lactones with hydrogen chloride in alcohols affords the corresponding acetal carboxylic acids in good to quantitative yields