A General Approach to Dehydro-Freidinger Lactams: Ex-Chiral Pool Synthesis and Spectroscopic Evaluation as Potential Reverse Turn Inducers
作者:Tobias Hoffmann、Reiner Waibel、Peter Gmeiner
DOI:10.1021/jo0261653
日期:2003.1.1
Starting from natural alpha-amino acids, a practical synthesis of the dehydro-Freidinger lactams 9a-h based on the ring-closing olefin metathesis reaction was investigated. The presented examples comprise 6-, 7-, 8-, 9-, and 10-membered cyclic dipeptide mimics. Structural variations were demonstrated. We approached the metathesis precursors 8a-h employing an N-alkylation/peptide-coupling strategy.
从天然的α-氨基酸开始,研究了基于闭环烯烃复分解反应的脱氢弗莱丁格内酰胺9a-h的实际合成。提出的实例包括6元,7元,8元,9元和10元环状二肽模拟物。证明了结构上的变化。我们采用N-烷基化/肽偶联策略研究了复分解前体8a-h。钌基催化剂10a或10b促进了随后的闭环。根据NMR和FT-IR研究显示,所得四残基11d发生分子内氢键键合。因此,证明了脱氢-弗雷丁格内酰胺作为稳定分子内NH(i + 3)... CO(i)氢键的潜在反向诱导剂的发展。