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A variety of 5‐(2H‐tetrazol‐5‐yl)‐4‐thioxo‐2‐(substituted phenyl)‐4,5‐dihydro‐1,3‐oxazin‐6‐ones (3a–k) have been synthesized from 1,3‐oxazine‐5‐carbonitriles (2a–k). The protocol represents an efficient, facile, and novel route from easily available precursors to unprecedented structures that share 1,3‐oxazine and tetrazole motifs of utmost value. All the synthesized compounds (3a–k) were evaluated...
A series of coumarinyl-pyrazolinyl substituted thiazoles derivatives were synthesized and their inhibitory effects on the DPPH and mushroom tyrosinase were evaluated. The results showed that all of the synthesized compounds exhibited significant mushroom tyrosinase inhibitory activities. In particular, 3-(5-(4-(benzyloxy)-3-methoxyphenyl)-1-(4-(4-bromophenyl)thiazol-2-yl)-4,5-dihydro-1H-pyrazol-3-yl)-2H-chromen-2-one...
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