A facile and efficient synthesis of tetrahydrobenzo[b]pyrans and dihydropyrano[4,3-b]pyrans derivatives using phosphate fertilizers MAP, DAP, and TSP as heterogeneous catalysts
作者:Soukaina Chehab、Youssef Merroun、Tourya Ghailane、Rachida Ghailane、Said Boukhris、Brahim Lakhrissi、Abdelaziz Souizi
DOI:10.1007/s13738-021-02223-x
日期:2021.10
A simple and efficient one-pot synthesis of tetrahydrobenzo[b]pyrans and dihydropyrano[4,3-b]pyrans derivatives was described. These reactions were realized through a three-component condensation of aromatic aldehyde, malononitrile, and 5,5-dimethyl-1,3-cyclohexanedione or 4-hydroxy-6-methylpyran-2-one using phosphate fertilizers monoammonium phosphate, NH4(H2PO4)2, (MAP), diammonium phosphate, (NH4)2(HPO4)
描述了一种简单有效的四氢苯并 [b] 吡喃和二氢吡喃并 [4,3-b] 吡喃衍生物的一锅法合成。这些反应是通过芳香醛、丙二腈和 5,5-二甲基-1,3-环己二酮或 4-羟基-6-甲基吡喃-2-one 的三组分缩合实现的,使用磷酸盐肥料磷酸一铵、NH 4 (H 2 PO 4 ) 2 , (MAP), 磷酸二铵, (NH 4 ) 2 (HPO 4 ), (DAP), 和三重过磷酸钙, Ca(H 2 PO 4 ) 2 .H 2O, (TSP) 作为多相催化剂。在最佳反应条件下,这些肥料表现出优异的催化活性。事实上,四氢苯并[b]吡喃和二氢吡喃并[4,3-b]吡喃衍生物在较短的反应时间内以良好的产率获得。此外,这些肥料可以重复使用至少四次,而不会显着降低其催化活性。因此,它们的应用可以促进绿色化学的发展。