Nucleophilic reactions with the novel condensation product derived from 3-formylchromone and 4-hydroxycoumarin
作者:Al-Shimaa Badran、Magdy A. Ibrahim、Aya Ahmed
DOI:10.1080/00397911.2021.1910961
日期:2021.6.18
primary amines yielded enaminones. Treatment of compound 3 with malononitrile and ethyl cyanoacetate produced pyran derivatives. Condensation of compound 3 with hydrazine hydrate afforded chromeno[4,3-c]pyrazole 13. Boiling compound 3 with cyanoacetohydrazide in DMF gave pyrazole derivative 12, while in boiling acetic acid gave pyrazolo[3,4-b]pyridine 15. Ttreating compound 3 with phenylhydrazine and hydroxylamine
摘要 -3-甲酰和4-羟基香豆素的缩合,得到一个新的3 - [(chromon -3-基)亚甲基] -2- ħ色烯-2,4(3 ħ) -二酮(3)。检查了合成基板3内的亲电子中心对各种亲核试剂的反应性。化合物3与多种伯胺的反应产生烯胺酮。用丙二腈和氰基乙酸乙酯处理化合物3可产生吡喃衍生物。将化合物3与水合肼缩合,得到铬诺[4,3- c ]吡唑13。沸腾化合物3用氰基乙酰肼在DMF中得到吡唑衍生物12,而在沸腾的乙酸中得到吡唑并[3,4- b ]吡啶15。用苯肼和盐酸羟胺对化合物3进行处理,分别得到吡唑16和异恶唑17。化合物3与胍和氰基胍反应,得到嘧啶衍生物18和19。使化合物3与乙二胺在1:1和1:2的摩尔比布置二氮杂20和色烯并[4,3- ë ] [1,4]二氮杂21。最后,凝结化合物3与ø苯二胺,ö氨基苯酚和ö -aminothiophenol得到苯并二氮杂22,苯并氧23,和苯并硫氮杂24,分别