Synthesis of 4-azepanones and heteroaromatic-fused azepines
作者:Subas M. Sakya、Andrew C. Flick、Jotham W. Coe、David L. Gray、Sidney Liang、Fabiola Ferri、Michel Van Den Berg、Kees Pouwer
DOI:10.1016/j.tetlet.2011.11.129
日期:2012.2
syntheses of versatile intermediate azepinones 2 and 3 are described. A 6-step intramolecular Dieckmann cyclization and decarboxylation led to the intermediate 3 while an alternate 4-step synthesis of 2 was developed and used for scale-up. The highlight of the second synthesis is the one-step per-bromination/elimination protocol from readily available azepinone 13a to provide a versatile scaffold in