N-Heterocyclic carbene catalyzed carbonyl umpolung reaction of aldehydes with Baylis-Hillman (BH) bromides as activated halides were realized for the first time. This intermolecular cross-coupling reaction features the easily available catalyst and mild reaction conditions to provide α-arylidene- γ-keto esters in excellent yields for a wide range of substrates. Thus, the present work opens up a new aspect of the synthetic utility of BH adducts via the reactivity umpolung of aldehydes.
首次实现了以 Baylis-Hillman (BH)
溴化物为活性卤化物催化醛的 N-杂环碳烯羰基umpolung 反应。这种分子间交叉偶联反应的特点是催化剂容易获得,反应条件温和,能以优异的收率提供δ-芳基-δ-
酮酯,适用于多种底物。因此,本研究为通过醛的反应性umpolung合成 BH 加合物的实用性开辟了一个新的方面。