Exploiting the Imidazolium Effect in Base-free Ammonium Enolate Generation: Synthetic and Mechanistic Studies
作者:Claire M. Young、Daniel G. Stark、Thomas H. West、James E. Taylor、Andrew D. Smith
DOI:10.1002/anie.201608046
日期:2016.11.7
function as ammonium enolate precursors in the absence of base. Enantioselective Michael addition–cyclization reactions using different α,β‐unsaturated Michael acceptors have been performed to form dihydropyranones and dihydropyridinones with high stereoselectivity. Detailed mechanistic studies using RPKA have revealed the importance of the “imidazolium” effect in ammonium enolateformation and have highlighted