Abstract
The demand for a cleaner environment has led chemists to develop greener protocols, notably by using catalysts. Encapsulation of an active substance on a solid support makes the process of separation of the catalyst much simpler, thereby generating minimal waste. We report herein the preparation of a novel basic catalyst, 3-methylaminopropyl-functionalized Fe3O4 nanoparticles (Fe3O4@MAP nanoparticles), which catalyzes the one-pot synthesis of [1,3]oxazine derivatives under ultrasonic conditions. Advantages include mild reaction condition, easy catalyst recovery and recyclability, shorter reaction time and use of green solvents. We also found that one derivative, 2-(4-methoxyphenyl)-2,3-dihydro-1H-naphtho[1,2-e][1,3]oxazine, suppresses the toxic effect caused by the chlorpyrifos pesticide on the blood cells of Polypedates teraiensis tadpoles.
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Abbreviations
- Fe3O4@MAP:
-
Ferrite@(3-methylaminopropyl)silyl
- FTIR:
-
Fourier transform infrared spectroscopy
- CDCl3 :
-
Deuterated chloroform
- DMSO-d6 :
-
Deuterated dimethyl sulfoxide
- 1H-NMR:
-
Proton nuclear magnetic resonance spectroscopy
- 13C-NMR:
-
Carbon nuclear magnetic resonance spectroscopy
- TMS:
-
Tetramethylsilane
- XRD:
-
X-ray diffraction
- TEM:
-
Transmission electron microscopy
- EDS:
-
Energy-dispersive X-ray spectroscopy
- TLC:
-
Thin-layer chromatography
- ESI–MS:
-
Electrospray ionization mass spectrometry
- TGA:
-
Thermogravimetric analysis
- VSM:
-
Vibrating sample magnetometry
- RBC:
-
Red blood corpuscles
- SEM:
-
Scanning electron microscopy
- MAPTMS:
-
(3-Methylaminopropyl)trimethoxysilane
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Acknowledgements
R. Nongrum would like to thank Sankardev College, Shillong, and UGC for the award of teacher fellowship under the Faculty Development Programme. R. Nongkhlaw acknowledges DST for financial support (EEQ/2016/00646). The analytical assistance from the Department of Chemistry—NEHU, SAIF—NEHU, Department of Nanotechnology—NEHU, CDRI—Lucknow, and IIT—Guwahati, is highly acknowledged.
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Nongrum, R., Kharkongor, M., Nongthombam, G.S. et al. [1,3]oxazines: green synthesis by sonication using a magnetically-separable basic nano-catalyst and investigation of its activity against the toxic effect of a pesticide on the morphology of blood cells. Environ Chem Lett 17, 1325–1331 (2019). https://doi.org/10.1007/s10311-019-00857-1
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DOI: https://doi.org/10.1007/s10311-019-00857-1