Coupling Radical Homoallylic Expansions with C–C Fragmentations for the Synthesis of Heteroaromatics: Quinolines from Reactions of <i>o</i>-Alkenylarylisonitriles with Aryl, Alkyl, and Perfluoroalkyl Radicals
作者:Christopher J. Evoniuk、Gabriel dos Passos Gomes、Michelle Ly、Frankie D. White、Igor V. Alabugin
DOI:10.1021/acs.joc.7b00262
日期:2017.4.21
radicals to isonitriles can be harnessed for initiating reaction cascades designed to overcome the stereoelectronic restrictions on homoallylic ring expansion in alkyne reactions and to develop a new general route for the preparation of N-heteroaromatics. This method utilizes alkenes as synthetic equivalents of alkynes by coupling homoallylic ring expansion to yield the formal “6-endo” products with aromatization
Coupling cyclizations with fragmentations for the preparation of heteroaromatics: quinolines from o-alkenyl arylisocyanides and boronic acids
作者:Christopher J. Evoniuk、Michelle Ly、Igor V. Alabugin
DOI:10.1039/c5cc04391c
日期:——
Stereoelectronic restrictions on homoallylic ring expansion in alkyne cascades can be overcome by using alkenes as synthetic equivalents of alkynes in reaction cascades that are terminated by C-C bond fragmentation....
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.
nucleophilic addition of a P-centered anion to isocyanides and cyclization reaction was developed for the efficient and practical synthesis of a wide range of 2-phosphinoyl indole and indol-3-ol derivatives. Unlike the well-documented synthesis of phosphorus-functionalized heterocycles via a P-centered radical, an anionic reactivityprofile of phosphine oxides is most likely involved in this domino transformation
开发了银催化的以 P 为中心的阴离子与异氰化物的化学选择性级联亲核加成和环化反应,用于有效且实用地合成各种 2-膦酰基吲哚和吲哚-3-醇衍生物。与通过P 中心自由基合成磷官能化杂环不同,氧化膦的阴离子反应性特征很可能参与这种多米诺骨牌转化。