graphene oxide@polyaniline-fef3 (go@pani-fef3) as a novel and effectual catalyst for the construction of 4h-pyrimido[2,1-b] benzothiazoles

A thermally and chemically sustainable nanocomposite, namely graphene oxide@polyaniline-fef3 (go@pani-fef3), was fabricated, and characterized using ft-ir (fourier transform infrared spectroscopy), xrd (x-ray diffraction), fe-sem (field emission scanning electron microscopy), edax (energy-dispersive x-ray spectroscopy), and tg (thermal gravimetric) analyses, and then 4h-pyrimido[2,1-b]benzothiazoles were constructed from aryl aldehydes, ethyl acetoacetate, and 2-aminobenzothiazole using go@pani-fef3 as catalyst; performing the reactions under solvent-free conditions, efficiency, high yields, relatively short times, and recoverability of the catalyst are some advantages of our protocol.