Catalytic Intramolecular Wittig Reaction Based on a Phosphine/Phosphine Oxide Catalytic Cycle for the Synthesis of Heterocycles
作者:Long Wang、Mei Sun、Ming-Wu Ding
DOI:10.1002/ejoc.201601628
日期:2017.5.10
The catalytic intramolecular Wittig reactions of carbonyl-containing bromides are reported. The R3PO byproducts participate in the catalytic cycle; therefore, the Wittig reaction can be accomplished with only a catalytic amount of organophosphorus reagent. The reaction has also been applied to the efficient and selective synthesis of isoquinolin-1(2H)-ones, indoles, 2,3-dihydro-1H-2-benzazepin-1-ones
报道了含羰基溴化物的催化分子内 Wittig 反应。R3PO 副产物参与催化循环;因此,只需使用催化量的有机磷试剂即可完成 Wittig 反应。该反应也已应用于异喹啉-1(2H)-酮、吲哚、2,3-二氢-1H-2-苯并氮杂-1-酮、苯并呋喃和 1,2-二氢喹啉的高效和选择性合成催化量的氧化膦(0.1 当量)和四甲基二硅氧烷/异丙醇钛 [TMDS/Ti(OiPr)4] 还原剂系统(产率:35-88%)。