A Cycloisomerization/Friedel–Crafts Alkylation Strategy for the Synthesis of Pyrano[3,4-<i>b</i>]indoles
作者:Matthew R. Medeiros、Scott E. Schaus、John A. Porco
DOI:10.1021/ol201532k
日期:2011.8.5
The synthesis of pyrano[3,4-b]indoles is described. The reaction sequence involves Sonogashira coupling of dihydropyran propargyl ether scaffolds with iodoanilines to afford intermediate indoles. Lewis acid-catalyzed ionization of the dihydropyrans, followed by intramolecular C3 alkylation of the indole, provides the title compounds.
描述了吡喃并[3,4- b ]吲哚的合成。反应序列涉及二氢吡喃炔丙基醚支架与碘苯胺的 Sonogashira 偶联,以提供中间体吲哚。二氢吡喃的路易斯酸催化电离,随后吲哚的分子内C3烷基化,提供标题化合物。