Synthesis of Arylated Benzofurans by RegioselectiveSuzuki-Miyaura Cross-Coupling Reactions of 2,3-Dibromobenzofurans- and 2,3,5-Tribromobenzofurans
作者:M. Hussain、N. Thai Hung、N. Abbas、R. A. Khera、I. Malik、T. Patonay、N. Kelzhanova、Z. A. Abilov、A. Villinger、P. Langer
DOI:10.1002/jhet.2083
日期:2015.3
Arylatedbenzofurans were prepared by regioselective Suzuki–Miyaura cross‐coupling reactions of 2,3‐dibromobenzofuran. The reactions proceeded with very good site‐selectivity in favor of the more electron deficient position 2. The Suzuki–Miyaura reactions of 2,3,5‐tribromobenzofuran also proceeded in favor of position 2.
The iridium(III)/copper(II)‐catalyzed dehydrogenative coupling of salicylaldehydes with internal alkynes proceeds efficiently under atmospheric oxygen through aldehyde C−H bond cleavage and decarbonylation. A variety of benzofuran derivatives can be synthesized by the environmentally benign procedure. DFT calculations suggest that this unique transformation involves the facile deinsertion of CO in
A cationic palladium complex bearing 1,10-phenanthroline ligand is found to catalyze direct CâH arylation reactions of heteroarenes with aryl iodides to give mono-, di-, or tri-arylated products selectively.