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[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

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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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Correspondence to Rishanlang Nongkhlaw.

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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

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