Tin Powder-Promoted Cascade Condensation/Allylation/Lactamization: Synthesis of Isoindolinones and Pyrazoloisoindol-8-ones
作者:Xiaoping Wang、Danfeng Huang、Ke-Hu Wang、Yingpeng Su、Yulai Hu
DOI:10.1021/acs.joc.9b00733
日期:2019.6.7
An efficient tin powder-promoted cascade condensation/allylation/lactamization of 2-formylbenzoic acids, hydrazides, and allyl bromides was developed for the synthesis of isoindolinones in good to excellent yields under mild conditions without any other additives or catalysts. Further manipulation of isoindolinones by iodocyclization process afforded the tricyclic tetrahydro-8H-pyrazolo[5,1-a]isoindol-8-one
已开发出一种有效的锡粉促进的2-甲酰基苯甲酸,酰肼和烯丙基溴的级联缩合/烯丙基化/内酰胺化反应,可在温和条件下以良好至极佳的收率合成异吲哚啉酮,而无需任何其他添加剂或催化剂。通过碘环化过程进一步操作异吲哚啉酮,得到三环四氢-8 H-吡唑并[5,1- a ] isoindol -8-one衍生物,可以将其转化为更复杂的四环四氢-4 H -azirino [1',2' :2,3] pyrazolo [5,1- a ] isoindol-4-ones。