Formation of <i>N</i>-Alkoxyindole Framework: Intramolecular Heterocyclization of 3-Alkoxyimino-2-arylalkylnitriles Mediated by Ferric Chloride
作者:Yunfei Du、Junbiao Chang、John Reiner、Kang Zhao
DOI:10.1021/jo7024477
日期:2008.3.1
[GRAPHICS]A variety of functionalized N-alkoxyindole-3-carbonitrile derivatives are achieved under remarkably mild conditions by applying a FeCl3-mediated intramolecular heterocyclization of 3-alkoxyimino-2-arylalkylnitliles. This novel synthesis allows the N-moiety on the side chain to be annulated to the benzene ring as the final synthetic step, which enables the functionalization of the benzenoid portion of the indole at an early stage of the synthesis.
Oxidative aromatic C–N bond formation: convenient synthesis of N-amino-3-nitrile-indoles via FeBr3-mediated intramolecular cyclization
functionalized N-amino-3-nitrile-indole derivatives are obtained via an intramolecular hetero-cyclization of 2-aryl-3-substituted hydrazono-alkylnitriles using FeBr3 as a single electron oxidant. This approach allows the N-moiety on the side-chain to be annulated to the benzene ring during the final synthetic step via direct oxidative aromatic C–N bond formation.