Organocatalytic Enantioselective Vinylogous Pinacol Rearrangement Enabled by Chiral Ion Pairing
作者:Hua Wu、Qian Wang、Jieping Zhu
DOI:10.1002/anie.201609911
日期:2016.12.5
An enantioselective pinacol rearrangement of functionalized (E)‐2‐butene‐1,4‐diols was developed. In the presence of a catalytic amount of a chiral BINOL‐derived N‐triflyl phosphoramide, these 1,4‐diols rearranged to β,γ‐unsaturated ketones in excellent yields and enantioselectivities. The formation of a chiral ion pair between the intermediary allylic cation and the chiral phosphoramide anion was
开发了功能化(E)-2-丁烯-1,4-二醇的对映选择性频哪醇重排。在催化量的手性BINOL衍生的N - triflyl磷酰胺的存在下,这些1,4-二醇以优异的收率和对映选择性重排为β,γ-不饱和酮。假定在中间烯丙基阳离子和手性磷酰胺阴离子之间形成手性离子对是造成高效手性转移的原因。这些手性结构单元进一步转化为对映体富集的多取代的四氢呋喃和四氢萘衍生物。