Oxidative Rearrangement of Flavanones with Thallium(III) Nitrate, Lead Tetraacetate and Hypervalent Iodines in Trimethyl Orthoformate and Perchloric or Sulfuric Acid
作者:István Németh、Attila Kiss-Szikszai、Tünde Zita Illyés、Attila Mándi、István Komáromi、Tibor Kurtán、Sándor Antus
DOI:10.5560/znb.2012-0214
日期:2012.12.1
flavanone [(±)-1] with thallium(III) nitrate, lead tetracetate, phenyliodonium diacetate (PIDA) or [hydroxyl( tosyloxy)iodo]benzene in trimethyl orthoformate. Besides the major ring-contraction product, the 2,3-dihydrobenzo[b]furan derivative (±)-4a, minor components were also identified, and their structures including the relative stereochemistry and a plausible mechanism of formation are reported and compared
已经开发了一种 HPLC 监测方案来跟踪黄烷酮 [(±)-1] 与硝酸铊 (III)、四乙酸铅、二乙酸苯基碘 (PIDA) 或 [羟基(甲苯磺酰氧基)碘]苯在原甲酸三甲酯中的反应。除了主要的缩环产物,2,3-二氢苯并[b]呋喃衍生物(±)-4a,还确定了少量组分,并报告了它们的结构,包括相对立体化学和可能的形成机制,并与文献进行了比较数据。通过HPLC在不同条件下监测氧化反应,并测定和比较产物的结构和比例。通过 PIDA 从 (±)-黄烷酮 (1) 形成黄酮 (5) 的优选通过对该试剂添加到 (±)-1 的烯醇醚衍生物形成的中间体的量子化学计算来解释。图解摘要黄烷酮与硝酸铊 (III)、四乙酸铅和高价碘在原甲酸三甲酯和高氯酸或硫酸中的氧化重排