oxidant-free reaction of cyclopropanols, DABCO ⋅ (SO2)2 and diaryliodoniumsalts in aqueous phase is described. This reaction proceeds under mild reaction conditions, affording bioactive aryl substituted γ-keto sulfones in 36%-90% yields with good functional group tolerance. This reaction proceeds through a γ-keto sulfinate intermediate, which undergoes a nucleophilic reaction with diaryliodoniumsalts, giving
Efficient Synthesis of γ-Keto Sulfones by NHC-Catalyzed Intermolecular Stetter Reaction
作者:Anup Bhunia、Santhivardhana Reddy Yetra、Sachin Suresh Bhojgude、Akkattu T. Biju
DOI:10.1021/ol301045x
日期:2012.6.1
The N-heterocyclic carbene-catalyzed intermolecular Stetter reaction of aldehydes with alpha,beta-unsaturated sulfones allows the atom-economic and selective formation of gamma-keto sulfones in good yields. Key to the success of this unique transition-metal-free carbon-carbon bond-forming reaction is the right choice of the NHC precursor and base. The reaction tolerates a broad range of different aldehydes.