Sodium borohydride → Sar-125844

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The 1-(6-{[6-(4-fluorophenyl)[1,2,4]triazolo[4,3-b]pyridazin-3-yl]sulphanyl}-1,3-benzothiazol-2-yl)-3-(2-morpholin-4-ylethyl)urea was prepared according to the method described in Example 1a, but using 240 mg of 3-chloro-6-(4-fluorophenyl)-1,2,4-triazolo[4,3-b]pyridazine, 338 mg of 1-(2-morpholin-4-ylethyl)-3-(6-sulphanyl-1,3-benzothiazol-2-yl)urea, 0.14 cm3 of triethylamine and 38 mg of sodium borohydride. The crude obtained is chromatographed on a Merck cartridge (30 g of silica 15-40 μm), elution being carried out with dichloromethane. 117 mg of 1-(6-{[6-(4-fluorophenyl)[1,2,4]triazolo[4,3-b]pyridazin-3-yl]sulphanyl}-1,3-benzothiazol-2-yl)-3-(2-morpholin-4-ylethyl)urea are thus recovered in the form of a beige solid, the characteristics of which are as follows:

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