Visible-Light-Promoted and One-Pot Synthesis of Phenanthridines and Quinolines from Aldehydes and O-Acyl Hydroxylamine
摘要:
A one-pot synthesis of phenanthridines and quinolines from commercially available or easily prepared aldehydes has been reported. O-(4-Cyanobenzoyl)hydroxylamine was utilized as the nitrogen source to generate O-acyl oximes in situ with aldehydes catalyzed by Bronsted acid. O-Acyl oximes were then subjected to visible light photoredox catalyzed cyclization via iminyl radicals to furnish aza-arenes. A variety of phenanthridines and quinolines have been prepared assisted by Bronsted acid and photocatalyst under visible light at room temperature with satisfactory yields.
Ligand-Free Suzuki Cross-Coupling Reactions: Application to β-Halo-α,β-Unsaturated Aldehydes
作者:Pranjal Gogoi、Pranjal Bezboruah、Romesh C. Boruah
DOI:10.1002/ejoc.201300491
日期:2013.8
ligand-free Suzuki–Miyaurareaction of β-halo α,β-unsaturated aldehydes with boronic acids in aqueous media at room temperature is described. Under the optimized conditions, both steroidal and nonsteroidal β-halo α,β-unsaturated aldehydes reacted rapidly with the boronic acids to provide a series of aryl-substituted derivatives in excellent yields. Moreover, the protocol was extended to the direct one-pot