Cobalt(II)-Catalyzed Isocyanide Insertion Reaction with Sulfonyl Azides in Alcohols: Synthesis of Sulfonyl Isoureas
作者:Tian Jiang、Zheng-Yang Gu、Ling Yin、Shun-Yi Wang、Shun-Jun Ji
DOI:10.1021/acs.joc.7b01127
日期:2017.8.4
A Co(II)-catalyzed isocyanide insertion reaction with sulfonyl azides in alcohols to form sulfonyl isoureas via nitrene intermediate has been developed. This protocol provides a new, environmentally friendly, and simple strategy for the synthesis of sulfonyl isoureaderivatives by employing a range of substrates under mild conditions.
A new route to the paullone scaffold was designed. The key step consisted in a free radical indole formation from an o-alkenyl arylisonitrile followed by Stille coupling with N-Boc-o-iodo-aniline. After deprotection and closure of the seven-membered ring by lactamisation, parent or cyano-substituted paullones were obtained in moderate to good yields.
Copper-Catalyzed Dihydroquinolinone Synthesis from Isocyanides and <i>O</i>-Benzoyl Hydroxylamines
作者:Zhen Yang、Kun Jiang、Ying-Chun Chen、Ye Wei
DOI:10.1021/acs.joc.9b00262
日期:2019.3.15
A copper-catalyzed protocol has been realized for the rapid assembly of dihydroquinolinones from readily accessible isocyanides and O-benzoyl hydroxylamines. The reactions (10 mol % of CuOAc, 10 mol % of dppe, 3 equiv of PhONa, 30 °C) deliver various structurally interesting dihydroquinolinones in moderate to good yields (up to 76%). The reactions may proceed in a cascade manner involving isocyanide
A formal [1 + 2 + 3] annulation of methyleneindolinones with o-alkenyl arylisocyanides has been developed for the general and efficient synthesis of both symmetrical and unsymmetrical indolo[3,2-b]carbazoles. The chemoselectivity of this domino reaction was tuned by a tethered alkenyl group, which enables successive formation of three new bonds and two rings from readily accessible starting materials
已开发了一种亚甲基吲哚酮与邻链烯基芳基异氰酸酯的正式[1 + 2 + 3]环合结构,用于对称和不对称的吲哚[3,2- b ]咔唑的常规合成。该多米诺反应的化学选择性通过束缚链烯基进行调节,该链烯基能够在一次操作中由易于接近的起始原料连续形成三个新键和两个环。此外,该方法被用作生物碱麦拉西唑C合成中的关键步骤。
Synthesis of 2,3-Dialkylindoles from 2-Alkenylphenylisocyanides and Imines by Silyltelluride- and Tin Hydride-Mediated Sequential Radical Reactions
A new method for the synthesis of 2,3-dialkylindoles is described. The silyltelluride-mediated coupling reaction of imines and 2-alkenylphenylisocyanides selectively occurred at the isocyanide moiety to give the corresponding imidoyltelluride. Tin hydride-mediated intramolecular cyclization of the imidoyltelluride affords 2,3-dialkylindoles in good to excellent combined yields.