Water → 3-Ethyl-5-(5-chloro-6-methylthio-3-pyridyl)-isoxazole

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Reaction Steps

A mixture of 3-chloro-5-ethynyl-2-methylthiopyridine (0.5 g, 2.72 mmol), 1-nitropropane (0.24 g, 0.27 mmol), 1,4-phenylenediisocyanate (1.3 g, 7.93 mmol) and triethylamine (5 drops) in benzene (20 mL) was heated under reflux with stirring for 8 hours, and allowed to stir at room temperature overnight. Water (1 mL) was added and the mixture stirred at room temperature for 2 hours. It was filtered through Celite, dried over anhydrous sodium sulphate and evaporated under reduced pressure. Recrystallisation of the residue from hexane gave the desired product (0.33 g, 48%) as a cream solid, melting point. 78-80° C.

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