Solid‐Solid Phase and Solvent‐Free Oxidative Removal of<i>N</i>‐(4‐Alkoxyphenyl) Groups of Monocyclic β‐Lactams with Ceric Ammonium Nitrate as a Cheap, Simple, and Efficient Method
作者:Aliasghar Jarrahpour、M. Zarei
DOI:10.1080/00397910801981326
日期:2008.5
Five N-(4-methoxyphenyl)- and five N-(4-ethoxyphenyl)-beta-lactams were prepared by ketene-imine [2+2] cycloaddition (Staudinger reaction). Then these 2-azetidinones were N-dearylated by grinding together with ceric ammonium nitrate without hazardous solvents in good to excellent yields. The solid-solid phase N-dearylation is easier, simpler, and more efficient than the general method in solution. The pure N-unsubstituted beta-lactams obtained by a nontedious workup and without further purification.