Synthesis of Pseudopeptides with Sulfoximines as Chiral Backbone Modifying Elements
摘要:
The synthesis of pseudopeptides with a chiral alpha -sulfonimidoylcarboxy moiety in the backbone is described. Starting from readily available (S-S)-S-methyl S-phenyl sulfoximine and various cyclic and acyclic alpha -amino acids the desired products are obtained in good yields with peptide coupling methodology, Specific secondary structures caused by intramolecular hydrogen bends may be adopted. Results of NMR studies to reveal conformational preferences will be discussed.
Syntheses of sulfoximine-containing pseudopeptides of type 2 are reported. Intramolecular hydrogen bonds have been revealed by NMR spectroscopy. (C) 1997, Elsevier Science Ltd.
Synthesis of Pseudopeptides with Sulfoximines as Chiral Backbone Modifying Elements
The synthesis of pseudopeptides with a chiral alpha -sulfonimidoylcarboxy moiety in the backbone is described. Starting from readily available (S-S)-S-methyl S-phenyl sulfoximine and various cyclic and acyclic alpha -amino acids the desired products are obtained in good yields with peptide coupling methodology, Specific secondary structures caused by intramolecular hydrogen bends may be adopted. Results of NMR studies to reveal conformational preferences will be discussed.
A Mild Synthetic Procedure for the Preparation of N-Alkylated Sulfoximines
作者:Carsten Bolm、Christian P. R. Hackenberger、Oliver Simić、Marinella Verrucci、Dirk Müller、Frank Bienewald
DOI:10.1055/s-2002-28514
日期:——
N-Alkylated sulfoximines have been synthesized in good yields by acylation of NH-sulfoximines followed by carbonyl reduction with complexed boranes. Enantiopure substrates react without racemization, and stereogenic centers originating from the acylating component are retained. If the acylation is performed by DCC coupling, this two-step procedure represents a rare example of a formal N-alkylation of sulfoximines under base-free conditions.