Synthesis of γ-Pyrones from Formal [4 + 2] Cyclization of Ketene Dithioacetals with Acyl Chlorides
作者:Mingshan Wang、Lou Shi、Yifei Li、Qun Liu、Ling Pan
DOI:10.1021/acs.joc.9b01254
日期:2019.8.2
been developed. Mediated by lithium bis(trimethylsilyl)amide, a series of γ-pyrones were obtained with a broad substrate scope. This unprecedented formal [4 + 2] cyclization provides a novel mode for ketene dithioacetals as versatile synthons. The synthesized γ-pyrones could be successfully transformed to 2-aryl/amino γ-pyrones and 2,3-dihydroimidazo[1,2-a]pyridin-7(1H)-ones mainly via the cleavage of
已开发出容易获得的乙烯酮二硫缩醛与酰氯的正式[4 + 2]环化反应。在双(三甲基甲硅烷基)酰胺锂的介导下,获得了一系列具有较宽底物范围的γ-吡喃酮。这种前所未有的形式化[4 + 2]环化为烯酮二硫缩醛作为通用合成子提供了一种新颖的模式。合成的γ-吡喃酮主要通过C–S键的裂解成功转化为2-芳基/氨基γ-吡喃酮和2,3-二氢咪唑并[1,2 - a ]吡啶-7(1 H)-酮。 。