access to enantioenriched δ,δ-disubstituted δ-valerolactones is described. A soft Lewis acid/hard Brønsted base cooperative catalyst allowed for direct catalytic asymmetric γ-addition of allyl cyanide to ketones, producing tertiary homoallylic alcohols with a Z-configured α,β-unsaturated nitrile. Electrophilic activation of the nitrile functionality triggered 6-exo-dig cyclization, and subsequent N-acylation
描述了有效获取对映体富集的δ,δ-二取代
δ-戊内酯的方法。软的
路易斯酸/硬布朗斯台德碱协同催化剂可将烯丙基
氰化物直接催化不对称地与酮进行γ加成反应,从而生成具有Z构型的α,β-不饱和腈的叔均
丙醇。腈官能团的亲电活化引发6- exo - dig环化,随后的N-酰化通过CN键断裂产生
δ-戊内酯骨架。