Synthesis of Indoles by Conjugate Addition and Ligand-Free Copper-Catalyzed Intramolecular Arylation of Activated Acetylenes with o-Haloanilines
作者:Detian Gao、Masood Parvez、Thomas G. Back
DOI:10.1002/chem.201002628
日期:2010.12.27
and efficient new synthesis of variously functionalized and substituted indoles was achieved by the addition and copper‐catalyzed coupling of N‐formyl‐o‐haloanilines with acetylenicsulfones, esters and ketones (see scheme; EWG=electron‐withdrawing group). The reaction employs copper(II) acetate under ligand‐free conditions without the need for exclusion of air and moisture.
Indole Synthesis by Conjugate Addition of Anilines to Activated Acetylenes and an Unusual Ligand-Free Copper(II)-Mediated Intramolecular Cross-Coupling
作者:Detian Gao、Thomas G. Back
DOI:10.1002/chem.201202307
日期:2012.11.12
A versatile new synthesis of indoles was achieved by the conjugate addition of N‐formyl‐2‐haloanilines to acetylenic sulfones, ketones, and esters followed by a copper‐catalyzed intramolecular C‐arylation. The conjugate addition step was conducted under exceptionally mild conditions at room temperature in basic, aqueous DMF. Surprisingly, the C‐arylation was performed most effectively by employing