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
讨论了通过用碱处理亚硝基缩醛 1 合成 N-有机氧基 β-内酰胺 2。基于副产物的形成,提出了重排为 N-有机氧基 β-内酰胺的机制。用二甲胺捕获中间体酰基硝基化合物 8 支持了该机制。此外,发现在更强的碱性条件下,这些N-有机氧基β-内酰胺可以进一步重排为3-有机氧基β-内酰胺。通过使用一系列结构不同的 N-有机氧基 β-内酰胺,证明了这种新型重排的普遍性。提出了将 N-有机氧基 β-内酰胺转化为 3-有机氧基 β-内酰胺的机制。((C) Wiley-VCH GmbH & Co. kGaA 69451 Weinheim, Germany, 2004)。