efficient heterogeneous catalyst for the synthesis of pyrimido[4,5-b]quinolines. Three-component reaction of various aromatic aldehydes, 6-amino-1,3-dimethyluracil, and dimedone or 1,3-cyclohexadione in H2O as a green solvent under reflux conditions after 2 h gave pyrimido[4,5-b]quinolines in high yields. Fe3O4 supported on cellulose was recycled in the reaction for 5 cycles without significant decrease
摘要通过原位制备Fe 3 O 4纳米颗粒并将其沉积在纤维素上,提供了负载在纤维素上的Fe 3 O 4纳米颗粒作为催化剂。经TEM和FAAS分析表征后,该催化剂用作合成嘧啶并[4,5- b ]喹啉的有效多相催化剂。各种芳香醛,6-氨基-1,3-二甲基尿嘧啶和二甲酮或1,3-环己二酮在作为绿色溶剂的H 2 O中于回流条件下在三小时后进行三组分反应,得到嘧啶基[4,5- b ]喹啉产量高。铁3 O 4 将负载在纤维素上的载体在反应中循环5个循环,而活性没有明显降低。 图形概要
An eco-friendly and magnetized biopolymer cellulose-based heterogeneous acid catalyst for facile synthesis of functionalized pyrimido[4,5-b]quinolines and indeno fused pyrido[2,3-d]pyrimidines in water
energy-dispersive X-ray spectroscopy, thermogravimetric analysis, X-ray diffraction, and scanning electron microscopy. Thereafter, its capability to promote the one-pot, three-componentsynthesis of pyrimido [4,5-b] quinolone and pyrido [2,3-d] pyrimidinederivatives was evaluated. The obtained results are indicative of excellent yields and short reaction times. The biopolymer based catalyst is readily recovered