Syntheses of indoles and quinolines based upon the Pauson-Khand reaction is described. The starting materials are an aromatic ethynylenamine and ethynylallylamine, which are obtained via Sonogashira coupling. Also. an aromatic ynamine is used for an attempt to synthesize indole.
Synthesis of aromatic natural product frameworks using enyne metathesis
Enynes, easily obtained by the Sonogashira coupling reactions of aromatic iodides. undergo. with good yields, en ne metathesis using the Grubbs catalyst. The resulting dienes are interesting carbo- and heterocycles which can give complex natural frameworks by Diels Alder reactions. Thus. an estradiol type skeleton is obtained in two steps from the corresponding enynes. An example of a metathesis-Diels-Alder cascade one-pot process is reported. (C) 2001 Elsevier Science Ltd. All rights reserved.