Development of a Protocol for Eight- and Nine-Membered Ring Synthesis in the Annulation of sp<sup>2</sup>,sp<sup>3</sup>-Hybridized Organic Dihalides with Keto Esters
作者:Gary A. Molander、Christoph Köllner
DOI:10.1021/jo001195w
日期:2000.12.1
eight- and nine-membered carbocycles. In this process wherein one alkenyl- or aryl bromide and a tethered alkyl chloride comprise the organic dihalide, a selective metal-halogen exchange reaction between the sp(2)-hybridized bromide and an organolithium initiates the process. Transmetalation to an organoytterbium reagent generates a species that undergoes selective carbonyl addition to the ketone of
已经开发出一种方案,其中可以进行各种二卤化物与酮酯的环化反应以提供进入八元和九元碳环的入口。在该方法中,其中一个烯基-或芳基溴化物和一个束缚的烷基氯构成有机二卤化物,sp(2)-杂交的溴化物与有机锂之间的选择性金属-卤素交换反应启动了该过程。向金属y试剂的重金属化生成了一种物质,该物质经过选择性羰基加成到酮酯的酮上,从而形成内酯中间体。使所得的氯代烷基内酯与碘化sa(II)进行分子内还原偶联完成所需的环化反应。