Access to 5-bromopentanal and 6-bromohexanal derivatives from Weinreb amides is described. The method relies on the sequential C-bromination/zircona-aminal hydrolysis of bis-C,O-zirconocenes, which are generated in situ from unsaturated Weinreb amides using Schwartz's reagent. Synthetic illustrations of such bromo-aldehydes, which can act as carbocycle and heterocycle precursors, are also presented
描述了从 Weinreb 酰胺中获得
5-溴戊醛和
6-溴己醛衍
生物的途径。该方法依赖于使用 Schwartz 试剂从不饱和 Weinreb 酰胺原位生成的双-C、O-
锆茂的连续 C-
溴化/
氧化锆-
氨基
水解。还介绍了可以作为碳环和杂环前体的这种
溴醛的合成说明。