A method for the annulation of 2-nitrophenols with aryl isothiocyanates is reported. The reactions proceeded in the presence of an iron(III) acetylacetonate catalyst, elemental sulfur, NaOH as a base, and DMSO as a solvent. Derivatives of 2-aminobenzoxazoles bearing nitro, cyano, acetyl, sulfone, secondary amine, and pyrrolyl groups were successfully isolated.
T. D. Nguyen, D. T. Tran, T. N. Huynh, T. M. Ly and T. T. Nguyen, RSC Adv., 2023, 13, 18156 DOI: 10.1039/D3RA02873A
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