Palladium(II)/Copper Halide/Solvent Combination for Selective Intramolecular Domino Reactions of Indolecarboxylic Acid Allylamides: An Unprecedented Arylation/Esterification Sequence
作者:Gianluigi Broggini、Vincenzina Barbera、Egle M. Beccalli、Elena Borsini、Simona Galli、Giuseppe Lanza、Gaetano Zecchi
DOI:10.1002/adsc.201100614
日期:2012.1
Intramolecular oxidative palladium‐catalyzed reactions of indolylallylamides in the presence of the couple bis(acetonitrile) palladium dichloride and copper(II) halide are described. Starting from 2‐ and 3‐indolylallylamides and involving in both cases the C‐3 position of the indole nucleus, variously substituted β‐carbolinones were obtained by arylation/halogenation, arylation/esterification or a
描述了在双(乙腈)二氯化钯和卤化铜(II)对存在下吲哚烯丙基内酰胺的分子内氧化钯催化反应。从2-和3-吲哚基烯丙基酰胺开始,在两种情况下都涉及吲哚核的C-3位置,通过芳基化/卤化,芳基化/酯化或芳基化/羰基烷氧基化工艺获得了各种取代的β-咔啉酮。另一方面,对2-吲哚基烯丙基内酰胺执行异常的氨基卤化/卤化反应会产生吡嗪并[1,2- a]吲哚产品。碳酯化过程是未知路径的结果,该路径涉及用作溶剂的DMF或DMA。3-吲哚基烯丙基酰胺反应的结果是由C-3吲哚位置的亲核攻击形成的假定螺环中间体上的酰基完全选择性地发生1,2-迁移。