Synthesis of 1‐(3
<i>H</i>
)isobenzofuranone compounds by tin powder promoted cascade condensation reaction
作者:Shangxian Wang、Ke‐Hu Wang、Bo Chang、Danfeng Huang、Yulai Hu
DOI:10.1002/aoc.6249
日期:2021.7
An efficient approach for the construction of phthalide compounds is developed through tin powder mediated cascade condensation reaction of 2-formylbenzoic acids with allyl bromides or α-bromoketone under mild reaction conditions. This method is easy to operate and can tolerate various functional groups to give the corresponding phthalides in good to excellent yields. The phthalides produced from α-bromoketone
通过锡粉介导的 2-甲酰基苯甲酸与烯丙基溴或α-溴酮在温和反应条件下的级联缩合反应,开发了一种有效的邻苯二甲酸酯化合物构建方法。该方法操作简单,可以耐受各种官能团,从而以良好到极好的收率得到相应的邻苯二甲酸酯。由α-溴酮生产的邻苯二甲酸酯可进一步转化为3,3a -dihydro -8 H -pyrazolo [5, l - a ]isoindol-8-one和8 H -pyrazolo[5, l- a ]isoindol-8-一。
Synthesis of chiral isoindolinones via asymmetric propargylation/lactamization cascade
作者:Jiao-Long Meng、Tang-Qian Jiao、Ya-Heng Chen、Rui Fu、Shu-Sheng Zhang、Qian Zhao、Chen-Guo Feng、Guo-Qiang Lin
DOI:10.1016/j.tetlet.2018.03.024
日期:2018.4
A Zn-mediated propargylation/lactamization cascade reaction with chiral 2-formylbenzoate derived N-tert-butanesulfinyl imines was realized, which provided a practical and efficient method for the synthesis of chiralisoindolinones. High diastereoselectivities (up to 97:3 dr) and good reaction yields were observed for most examined cases.
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 tinpowder-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。
Anti-allergic-3-carboxy-isocoumarin compositions and methods of use
申请人:Beecham Group Limited
公开号:US03975535A1
公开(公告)日:1976-08-17
3-Carboxyisocoumarins, 2-thiaisocoumarins and related isocarbostyrils are useful anti-allergic agents. Several of these compounds are novel, and a process for their preparation is provided.
attracted much attention in the pharmaceutical and agrochemical industries. Many strategies have already been developed to achieve the synthesis of fluorinated heterocycles. Formidable challenges remain, however, in the synthesis of fluorinated isocoumarin derivatives that are among the most alluring structural motifs. Herein, the indium-catalyzed C−F bond transformation of 2-(2,2-difluorovinyl) benzoates