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An efficient and green approach has been developed for the synthesis of (substituted phenyl)-3-(4-(4nitrophenylthio)phenyl)urea/thiourea derivatives 6(a-j) using non-hazardous green solvent, PEG-400 under ultrasound irradiation conditions in the presence of a reusable silica-supported Lewis acid catalyst, nano-BF3SiO2 via simple addition reaction of 4-(4-nitrophenylthio)aniline (4) with substituted phenyl isocyanates/isothiocyanates 5 (a-j). The advantages of developed method are convenient, offered higher yield of products with purity, less reaction time, easy work-up and reusability of the catalyst. Structures of the title products were established by IR, NMR ( 1 H, 13 C), mass spectral data and elemental analysis. Antimicrobial activity of the newly synthesized compounds was tested and the bio-screening data disclosed that urea derivatives, 6a and 6d, and thiourea derivatives, 6f, 6i and 6j showed potential antimicrobial activity against the growth of selected microorganisms.

Unsymmetrical urea and thiourea derivatives: An efficient nano BF 3-SiO 2 catalyzed PEG-400 mediated sonochemical synthesis and biological evaluation