Benzoazepine-Fused Isoindolines via Intramolecular (3 + 2)-Cycloadditions of Azomethine Ylides with Dinitroarenes
作者:Steven M. Wales、Daniel J. Rivinoja、Michael G. Gardiner、Melissa J. Bird、Adam G. Meyer、John H. Ryan、Christopher J. T. Hyland
DOI:10.1021/acs.orglett.9b01580
日期:2019.6.21
N-substituted α-amino acids to form unprecedented benzoazepine-fused isoindolines. The reaction proceeds via a dearomatization/rearomatization sequence involving an intramolecular (3 + 2)-cycloaddition between the in situ formed azomethine ylide and the dinitroarene. Various glycine derivatives are tolerated as well as branched substrates based on cyclic, α-mono-, and α,α-disubstituted amino acids, giving
带有3,5-二硝基苯基侧基的氨基苯甲醛与N-取代的α-氨基酸发生热反应,形成前所未有的苯并氮杂稠合的异二氢吲哚。反应通过脱芳香化/再芳香化顺序进行,该顺序涉及原位形成的甲亚胺基立德和二硝基芳烃之间的分子内(3 + 2)-环加成。基于环状,α-单-和α,α-二取代的氨基酸,可以耐受各种甘氨酸衍生物以及支链的底物,在许多情况下可得到单一的非对映异构体。该方法是可扩展的,并提供具有硝基基团的产品以备进一步处理。