作者:David S. Laitar、John W. Kramer、Bryan T. Whiting、Emil B. Lobkovsky、Geoffrey W. Coates
DOI:10.1039/b913698c
日期:——
4-Substituted oxazolines, which are readily synthesized from naturally occurring α-amino acids, are converted efficiently and stereospecifically to β-amidoaldehydes in the presence of synthesis gas and catalytic dicobalt octacarbonyl.
Novel Use of <i>N</i>-Benzoyl-<i>N,O</i>-acetals as <i>N</i>-Acylimine Equivalents in Asymmetric Heterocycloaddition: An Extended Enantioselective Pathway to β-Benzamido Aldehydes
For the first time, easily available N-(alpha-methoxyalkyl)amides were successfully used as synthetic equivalents of N-acylimines in an asymmetric heterocycloaddition process. The facial-controlled formation of 6-alkoxydihydrooxazines was thus achieved by SnCl4-promoted heterocycloaddition of (R)-O-vinyl pantolactone. By simple acidic hydrolysis of the crude heteroadducts, new beta-aryl- and beta-alkyl-substituted benzamido aldehydes were thus obtained in good overall yields with high enantioselectivities.
Angiotensin-converting enzyme inhibitors: synthesis and biological activity of acyltripeptide analogs of enalapril
作者:William J. Greenlee、Patricia L. Allibone、Debra S. Perlow、Arthur A. Patchett、Edgar H. Ulm、Theodore C. Vassil
DOI:10.1021/jm00382a008
日期:1985.4
The synthesis and biologicalactivity of a series of inhibitors of angiotensin-convertingenzyme (EC 3.4.15.1) are described. Incorporation of the substituted N-carboxymethyl dipeptide design of enalapril (MK-421) into acyl tripeptides and larger peptides yielded potent inhibitors of the enzyme. These can be viewed as substrate analogues in which the carbonyl of the scissile peptide bond is replaced