Palladium-Catalyzed Oxidative Cyclizations: Synthesis of Dihydropyranones and Furanones
作者:Maud Reiter、Hazel Turner、Rebecca Mills-Webb、Véronique Gouverneur
DOI:10.1021/jo051274d
日期:2005.10.1
good yields. The Pd(II)-mediated oxidative cyclization was expanded to α-hydroxyenones leading to furan-3(2H)-one derivatives, which include natural product bullatenone and a known precursor of geiparvarin. The sole product of the oxidative cyclization of α,β-dihydroxyenone was a five-membered furan-3(2H)-one derivative, suggesting that the ring closure of these diols is both chemo- and regioselective
将引起各种β-羟基烯酮的硼介导的顺式和反式立体选择性醛醇缩合反应与Pd (II)介导的氧化环化反应偶联,以高收率得到2,3,6-三取代的顺式和反式二氢吡喃酮。Pd (II)介导的氧化环化反应扩展为α-羟基烯酮,生成了呋喃3(2 H)-one衍生物,其中包括天然产物Bullatenone和已知的geiparvarin前体。α,β-二羟基烯酮的氧化环化的唯一产物是五元呋喃-3(2 H)-one衍生物,这表明这些二醇的闭环具有化学选择性和区域选择性。