Water → 4-(5-{3-[5-(4-Methoxy-phenyl)-oxazol-2-yl]-phenyl}-[1,3,4]thiadiazol-2-ylmethyl)-benzoic acid methyl ester

Participants

Reaction Conditions

Reaction Steps

To a suspension of 0.25 g (0.51 mmol) 4-[2-(N′-{3-[5-(4-Methoxy-phenyl)-oxazol-2-yl]-benzoyl}-hydrazino)-2-oxo-ethyl]-benzoic acid methyl ester from Preparation 8 in 10 mL dry dioxane was added P2S5 in one portion. The resulting mixture was warmed to 50° C. for 1 hour before cooling to room temperature and adding about 20 mL water. Stirred 2 hours and then filtered off solid product. Triturated in hot MeOH and filtered. Dissolved in THF and filtered through a plug of flash silica gel with THF eluent. Concentration gave 0.18 g (73%) desired product. Used directly in the procedure of Example B3 without characterization.

Provenance & Evidence