Studies on Stereoselective [2+2] Cycloadditions between N,N-Dialkylhydrazones and Ketenes
作者:Eloísa Martín-Zamora、Ana Ferrete、José M. Llera、Jesús M. Muñoz、Rafael R. Pappalardo、Rosario Fernández、José M. Lassaletta
DOI:10.1002/chem.200400452
日期:2004.12.3
chiral, non-racemic N,N-dialkylhydrazones 1 and functionalized ketenes constitute an efficient methodology for the stereoselective construction of the beta-lactam ring. The potential for fine tuning of the dialkylamino auxiliary structure, the availability of a high-yielding deprotection method for the release of the free azetidinones, and the high thermal and chemical stability of hydrazones as N-dialkylamino