Hydrochloric Acid → 6-[N-(5-Chloro-2-(2-methylprop-2-en-1-yloxy)benzyl)-N-ethylamino]-3-cyanopyridazine

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To a solution of 6-[N-(5-chloro-2-(2-methylprop-2-en-1-yloxy)benzyl)-N-ethylamino]-pyridazine-3-carboxamide (example 18) (210 mg, 0.6 mmol) in pyridine (10 ml) at 0° C. was added methane sulfonyl chloride (0.5 ml, 0.6 mmol) and the mixture allowed to stir (gradually coming to an ambient temperature as the ice melts) for 60 hours. The solution was poured into 2 N hydrochloric acid (50 ml) over ice and the product extracted with diethyl ether (200 ml), washed with water (3×200 ml), dried over anhydrous magnesium sulphate and the solvent removed in vacuo to give the title compound as a brown gum (260 mg) which was used without further purification.

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