Metalated O-silyl cyanohydrins of beta-silyl-alpha,beta-epoxyaldehyde have been found to serve as functionalized homoenolate equivalents by a tandem sequence involving base-promoted ring opening of the epoxide, Brook rearrangement, and alkylation of the resulting allylic anion. On the basis of mechanistic studies involving competitive experiments using the diastereomeric cyanohydrins, we propose a
已经发现β-甲
硅烷基-α,β-环氧醛的
金属化的O-甲
硅烷基
氰醇通过串联序列的功能化的均
戊酸酯等效物,所述串联序列涉及碱促进的
环氧化物的开环,布鲁克重排和所得烯丙基阴离子的烷基化。在涉及使用非对映体
氰醇的竞争性实验的机理研究的基础上,我们提出了一种反应途径,该途径涉及通过协同过程经由
环氧化物的抗开环并随后形成O-Si键而形成的
硅酸盐中间体36。