作者:Akira Saito、Naoya Kumagai、Masakatsu Shibasaki
DOI:10.1016/j.tetlet.2014.04.006
日期:2014.5
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。