N-Methylbutylamine → N-Butyl-N'-(5-tert-butyl-1,2-oxazol-3-yl)-N-methylurea

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Reaction Steps

To a suspension of 5-t-butyl-3-isoxazolyl isocyanate (1.99 g) in benzene (120 ml), N-methylbutylamine (1.15 g) is added, and the resultant mixture is refluxed for 3 hours. After cooling, the reaction mixture is evaporated to remove the solvent, and the residue is chromatographed on a plate of silica gel to give 1-butyl-1-methyl-3-(5-t-butyl-3-isoxazolyl)urea (2.75 g). This substance is recrystallized from hexane to give crystals melting at 65.5° to 66.5° C. The yield is 89.8%.

Provenance & Evidence