Hydrochloric Acid → 8-[5-({[5-Methyl-1-(4-methylphenyl)-1H-pyrazol-4-yl]carbonyl}amino)pyridin-2-yl]-1,4-dioxaspiro[4.5]decane-8-carboxylic acid ethyl ester

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

Thionyl chloride (185 mg) and N,N-dimethylformamide (catalytic amounts) were added at room temperature to a solution of 5-methyl-1-(4-methylphenyl)-1H-pyrazole-4-carboxylic acid (210 mg) described in Reference Example 4 in toluene (3.0 ml) and stirred at 80° C. for an hour. The solvent and excess amounts of thionyl chloride were evaporated. The resulting reaction mixture of a pyridine solution (1.5 ml) was added to a solution of 8-(5-aminopyridin-2-yl)-1,4-dioxaspiro[4.5]decane-8-carboxylic acid ethyl ester (312 mg) in pyridine (1.8 ml) and stirred at 40° C. for an hour. After the reaction, the reaction solution was cooled to room temperature, adjusted to pH 4-5 by the addition of 1N hydrochloric acid aqueous solution and extracted with ethyl acetate. The organic layer was washed with 1N hydrochloric acid aqueous solution, dried over anhydrous sodium sulfate and concentrated to give the titled compound (400 mg) as a white solid.

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