Stereodivergent synthesis of the first bis(cyclobutane) γ-dipeptides and mixed γ-oligomers
摘要:
Diastereomeric bis(cyclobutane) gamma-dipeptides, a new class of gamma-peptides, have been synthesized efficiently from both enantiomers of conveniently protected 3-amino-2,2-dimethyl-l-carboxylic acid. These amino acids have been prepared in very good overall yields through enantiodivergent synthetic routes starting from (-)-cis-pinononic acid. Mixed gamma-oligomers have also been prepared from GABA and cyclobutane residues. (C) 2008 Elsevier Ltd. All rights reserved.