Metal-free synthesis of alkynyl imines using an oxophosphonium-mediated approach at ambient temperatures
摘要:
A metal-free approach was developed for the mild synthesis of N-aryl alpha-alkynyl imines from corresponding amide precursors for the first time. The electronic effects of substrates and the reaction mechanisms were investigated and discussed. This newly developed oxophosphonium-triggered one-pot multiple-step method presents the advantages of mild conditions, ease of operation and satisfactory efficiency. (c) 2008 Elsevier Ltd. All rights reserved.
In the present study, the stereodivergent synthesis of both cis- and trans-β-lactams is presented using the following three reactions: iminocyclobutenone formation, chemoselective reduction of imino groups, and thermalrearrangement of aminocyclobutenones as crucial steps, in which the starting materials, iminocyclobutenones, were readily synthesized using conjugate addition reactions of alkynyl imines