Synthesis of Fluoroalkene Dipeptide Isosteres by an Intramolecular Redox Reaction Utilizing <i>N</i>-Heteorocyclic Carbenes (NHCs)
作者:Yoko Yamaki、Akira Shigenaga、Kenji Tomita、Tetsuo Narumi、Nobutaka Fujii、Akira Otaka
DOI:10.1021/jo900134k
日期:2009.5.1
which prompted us to use an intramolecular redox reaction mediated by N-heterocyclic carbenes (NHCs) for the preparation of FADIs. Instead of the enoates, γ,γ-difluoro-α,β-enal 20 and γ,γ-difluoro-α,β-enoylsilane 34 were converted to FADIs by an NHC-mediated intramolecular redox reaction, whereby aldehyde components reduced the allylic difluoride component in an SN2′ manner with accompanying monodefluorination
(Z)-氟烯烃二肽等排体(FADI 16)已作为潜在的二肽模拟物,其具有用氟烯烃取代母体肽键的功能。以前,我们通过用有机铜或SmI 2还原γ,γ-二氟-α,β-烯酸酯来合成FADI ,这促使我们使用由N-杂环卡宾(NHC)介导的分子内氧化还原反应来制备FADI。通过NHC介导的分子内氧化还原反应将γ,γ-二氟-α,β-烯醛20和γ,γ-二氟-α,β-烯丙基硅烷34代替烯酸酯,从而使醛成分还原了二氟烯丙基S N中的分量2'方式伴有单脱氟。