Synthesis and Rearrangement of<i>N</i>-Organyloxy β-Lactams Derived from a (4+2)/(3+2) Sequential Cycloaddition Reaction Involving Enol Ethers and Nitro Alkenes
作者:Leon W. A. van Berkom、George J. T. Kuster、René de Gelder、Hans W. Scheeren
DOI:10.1002/ejoc.200400371
日期:2004.11
The synthesis of N-organyloxy beta-lactams 2 by treatment of nitroso acetals 1 with a base is discussed. Based on the formation of a by-product, a mechanism for the rearrangement to N-organyloxy beta-lactams is proposed. The mechanism is supported by the trapping of the intermediate acyl nitro compound 8 with dimethylamine. Furthermore, it was discovered that upon more forcing basic conditions these