An improved method for the preparation of desoxopeffides—reductions of endothiopeptides
作者:Frank S. Guziec、Loide Mayer Wasmund
DOI:10.1016/s0040-4039(00)94324-7
日期:1990.1
Three new procedures for the synthesis of desoxopeptides from endothiopeptides are reported: 1) Raney nickel desulfurizafion, 2) alkylation with triethyloxonium tetrafluoroborate followed by sodiumborohydride reduction, and 3) nickelboride reduction. Of these three, reduction with nickelboride was found to be superior due to high yields, reproducibility and convenience.
7-trisubstituted 6-oxoperhydropyrrolo[1,2-a]pyrazines, as spacer templates for peptidomimetics, from the corresponding 3,6-dioxo analogues is described using different reduction methods. An alternative approach, based on the intramolecular reductive amination of 4-ketodiesters derived from ψ[CH2NH] pseudodipeptides and subsequent γ-lactamization, was also used for the stereoselective preparation of these