Synthesis of Benzodiazepine β-Turn Mimetics by an Ugi 4CC/Staudinger/Aza-Wittig Sequence. Solving the Conformational Behavior of the Ugi 4CC Adducts
作者:María Sañudo、María García-Valverde、Stefano Marcaccini、Jacinto J. Delgado、Josefa Rojo、Tomás Torroba
DOI:10.1021/jo8025862
日期:2009.3.6
5-Oxobenzo[e][1,4]diazepine-3-carboxamides were synthesized by sequential Ugi reaction−Staudinger/aza-Wittig cyclization. The pseudopeptidic backbone of the new benzodiazepine derivatives superimposed well with type I, I′, II, and II′ β-turn motifs. The intermediate Ugi adducts were characterized as two conformers of the enol form by the correlation between 1H NMR spectra and X-ray diffraction structures
通过顺序Ugi反应-Staudinger / aza-Wittig环化合成了5-Oxobenzo [ e ] [1,4] diazepine -3-carboxamides。新的苯二氮杂卓衍生物的假肽骨架与I,I',II和II'型β-转角基序重叠良好。通过1 H NMR光谱与模型化合物的X射线衍射结构之间的相关性,将中间体Ugi加合物表征为烯醇形式的两个构象异构体。