The synthetic plasma kallikrein (PK) inhibitor trans-4-aminomethylcyclohexanecarbonylphenylalanine-4-carboxymethylanilide (PKSI-527) consists of three parts. Each part was replaced by analogues in an attempt to improve the potency and the selectivity of PKSI-527. Among the peptides examined, trans-4-aminomethylcyclohexanecarbonylphenylalanine-4-carboxyanilide (peptide 16) inhibited PK with a high selectivity and an IC50 value of 2.7μM, being as potent as PKSI-527.
An efficient synthesis of cyclic urethanes from Boc-protected amino acids through a metal triflate-catalyzed intramolecular diazocarbonyl insertion reaction
作者:Jae-Chul Jung、Mitchell A. Avery
DOI:10.1016/j.tetlet.2006.08.111
日期:2006.11
A simple and efficient synthesis of cyclic urethanes and related oxazinanones 1a–l from diazoketones 3a–l is described. The transformation involves generation of carbenes by activation of diazo groups using metal triflates in intramolecular diazocarbonyl insertionreactions in high overall yields.
Highly Enantioselective Ruthenium-Catalyzed Reduction of Ketones Employing Readily Available Peptide Ligands
作者:Anders Bøgevig、Isidro M. Pastor、Hans Adolfsson
DOI:10.1002/chem.200305553
日期:2004.1.5
Highly efficient and selective catalysts for the asymmetric reduction of arylalkylketones under hydrogen-transfer conditions (2-propanol) were obtained by combining a novel class of pseudo-dipeptide ligands with [[RuCl(2)(p-cymene)](2)]. A library of 36 dipeptide-like ligands was prepared from N-Boc-protected alpha-amino acids and the enantiomers of 2-amino-1-phenylethanol and 1-amino-2-propanol
Ruthenium-complexes of novel carbohydrate based pseudo-dipeptide ligands effectively and selectively catalyze the reduction of a broad range of aryl-alkyl ketones under ATH conditions. Excellent enantioselectivities (>99% ee) are obtained using aminosugars as the sole source of chirality.
for the preparation of seven-membered cyclic α,β-dipeptides is described. Following coupling of N-protected α-amino acids with N-substituted β-aminoacid tert-butyl esters, that affords linear α,β-dipeptides, the protecting groups at the terminal functionalities were removed and the open-chain dipeptides were cyclized with phenylphosphonic dichloride, PhP(O)Cl2, to give the desired cyclic α,β-dipeptides