Regioselective Reversal in the Cyclization of 2-Diazo-3,5-dioxo-6-ynoates (Ynones, Ynamide): Construction of γ-Pyrones and 3(2<i>H</i>)-Furanones Starting from Identical Materials
作者:Feng Wang、Shengle Lu、Bo Chen、Yali Zhou、Ying Yang、Guisheng Deng
DOI:10.1021/acs.orglett.6b02973
日期:2016.12.16
The AgSbF6-catalyzed cyclization of 2-diazo-3,5-dioxo-6-ynoates (ynones, ynamide) in alcoholic solvents affords γ-pyrones, whereas the AgOAc-catalyzed cyclization in 1,2-dichloroethane (DCE) produces 3(2H)-furanones. The cyclization reactions proceeded cleanly under mild reaction conditions, and the desired γ-pyrones or 3(2H)-furanones were obtained in excellent yield. It was observed for the first
在酒精溶剂中,AgSbF 6催化的2-重氮3,5-二氧杂-6-羟基酸酯(炔酮,乙酰胺)的环化反应生成γ-吡喃酮,而AgOAc催化的1,2-二氯乙烷(DCE)的环化反应生成3 (2 H)-呋喃酮。环化反应在温和的反应条件下进行得很干净,并且以极好的收率获得了所需的γ-吡喃酮或3(2 H)-呋喃酮。首次观察到催化剂和溶剂均在选择性形成中起关键作用。事实证明,这种独特的逆区域选择性方法非常有效,除了在三键位置具有脂族基和Me 3 Si基的底物外。