Regiocontrolled Synthesis of γ-Hydroxybutenolides via Singlet Oxygen-Mediated Oxidation of 2-Thiophenyl Furans
作者:Vasiliki Kotzabasaki、Georgios Vassilikogiannakis、Manolis Stratakis
DOI:10.1021/acs.joc.6b00660
日期:2016.5.20
synthesis of γ-hydroxybutenolides. The carbonyl group in butenolide holds the position of thiophenyl moiety in reacting furans. Decomposition of the initially formed [4 + 2] endoperoxide into products through a radical chain mechanism is proposed, as the fate of thiophenyl moiety is its transformation into ethyl phenylsulfenate (PhS-OEt) and diphenyldisulfide. Under the reaction conditions, the sulfenate is
2-硫代苯基取代的呋喃在乙醇中的光氧合作用可快速,区域控制且定量地合成γ-羟基丁烯内酯。丁烯内酯中的羰基在呋喃反应中保留了硫苯基部分的位置。提出了通过自由基链机理将最初形成的[4 + 2]内过氧化物分解成产物的方法,因为硫代苯基部分的命运是将其转化为苯基亚硫酸乙酯(PhS-OEt)和二苯基二硫化物。在反应条件下,亚磺酸盐被快速氧化成相应的亚磺酸盐。