Domino synthesis of fused hexacyclic imidazoquinolinoacridinones catalyzed by CuI/l-proline

An efficient synthesis of 16H-dibenzo[2,3:6,7][1,4]oxazepino[5,4-b]quinazolin-16-ones via an Ullmann reaction catalyzed by CuI

CuI functions as a mild Lewis acid catalyst to promote the condensation and cyclization reaction of 2-amino-N-(2-hydroxyphenyl)benzamide and 2-bromobenzaldehyde to build the quinazoline moiety first. With the addition of Cs₂CO₃, it also can catalyse the subsequent intramolecular Ullmann type reaction to give 16H-dibenzo[2,3:6,7][1,4]oxazepino[5,4-b]quinazolin-16-ones in good yields.

An efficient synthesis of 6-arylbenzo[4,5]imidazo[2,1-a]isoquinolines via sequential α-arylation of carbonyl and deacylation catalyzed by CuI

Dibenzoyl methane was found to undergo α-arylation of carbonyl and deacylation reaction with 2-(2-bromophenyl)-1H-benzo[d]imidazoles catalyzed by CuI in the presence of Cs₂CO₃, and provided an efficient synthesis of 6-arylbenzo[4,5]imidazo[2,1-a]isoquinolines.

Functionalized α,β-ynones: efficient ligand for Cu catalyzed Sonogashira-type cross-coupling reaction

1,3-Yones as σ-, π-electron donating ligands significantly accelerated the cross-coupling reactions of aryl iodides with terminal alkynes, in which as low as 0.1 to 1 mol% of CuI were efficiently activated.

An efficient synthesis of 11-aryl-10-oxo-7,8,10,11-tetrahydro-1H-[1,2,3]triazolo [4′,5′:3,4]benzo[1,2-b][1,6]naphthyridine derivatives under catalyst-free conditions

A three-component reaction of an aromatic aldehyde, 1H-benzo[d][1,2,3]triazol-5-amine and tert-butyl 2,4-dioxopiperidine-1-carboxylate in refluxing EtOH under catalyst-free conditions furnishes the title compounds in high yields.