Design and Synthesis of Potent, Non-peptide Inhibitors of HCV NS3 Protease
摘要:
Starting from a hexapeptide boronic acid lead, 3-amino bicyclic pyrazinones as novel beta-sheet dipeptide mimetics have been designed and synthesized. Side-chain manipulation of this scaffold generated a series of potent, nonpeptidic inhibitors of HCV NS3 protease. (C) 2003 Elsevier Science Ltd. All rights reserved.
The lithiumenolates of N-Boc protected pyroglutamic ethyl or tert-butyl esters react with electrophiles in good yield without epimerization of the chiral centre. With benzyl bromides the process is stereospecific, yielding exclusively the trans isomer. However, with other reactive electrophiles a 2:1 trans/cis diastereomeric mixture was obtained, regardless of the steric bulk of the ester group.