Three new α-cyclopropyl nitrones have been synthesized as mechanistic probes for reductive cross-coupling reactions of nitrones. The α-cyclopropylcarbinyl radical intermediate formed by single electron transfer from SmI2 to these nitrones is not prone to ring opening, due to a unique stabilization by the vicinal N-O-Sm system. Consequently, β-cyclopropyl hydroxylamines could be prepared in high yield from α-cyclopropyl nitrones.
合成了三种新的α-环丙基硝酮,作为硝酮还原交叉偶联反应的机理探针。从
SmI2到这些硝酮的单电子转移所形成的α-环丙基羟基自由基中间体不易发生开环反应,这归因于邻位N-O-Sm体系的独特稳定作用。因此,可以高产率地从α-环丙基硝酮中制备β-环丙基
羟胺。