A rapid and highly efficient methodology for the synthesis of 3-methyl-4-(hetero)arylmethylene isoxazole-5(4H)-ones has been developed using sulfated polyborate as a catalyst. The multicomponent reaction of an aromatic/heterocyclic aldehyde, hydroxylamine hydrochloride, and ethyl acetoacetate under a solvent free condition at 80 degrees C is described. This protocol has promising features for the reaction response such as shorter reaction time, easy work-up, ease of separation of pure product with high yields and simplicity in the experimental procedure. The products have been obtained in high yields (80-90%) and convenient reaction time (15-30 min). The method is operationally simple and eco-friendly. (C) 2017 Elsevier Ltd. All rights reserved.
机构:
Hutatma Rajguru Mahavidyalaya, Postgrad Ctr Organ Chem, Pune 410505, Maharashtra, India
Hutatma Rajguru Mahavidyalaya, Dept Chem, Pune 410505, Maharashtra, IndiaHutatma Rajguru Mahavidyalaya, Postgrad Ctr Organ Chem, Pune 410505, Maharashtra, India