Synthesis of bicyclic dipeptide mimetics for the cholecystokinin and opioid receptors
作者:John M. Ndungu、Xuyuan Gu、Dustin E. Gross、James P. Cain、Michael D. Carducci、Victor J. Hruby
DOI:10.1016/j.tetlet.2004.03.146
日期:2004.5
δ-opioid receptors. To constrain the peptide into the biologically active conformation(s), bicyclic dipeptide mimetics for Nle-Gly and homoPhe-Gly were designed and synthesized from β-substituted aspartic acids. Alkylation of L-asparticacid using lithium bis(trimethylsilyl)amide (LHMDS) in the presence of hexamethylphosphoramide (HMPA) gave β-substituted aspartic acids, with the major product being the