Hydrochloric Acid → HCID 67188225, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of dry acetonitrile in toluene (0.66 mL, 13 mmol, 5 eq) cooled down to −78° C. under nitrogen, a solution of n-butyllithium in n-hexane (5.2 mL, 13 mmol, 5 eq) was added dropwise. The mixture was left stirring at −78° C. for 20 minutes and then a solution of pyrazolo[1,5-a]pyridine-3-carboxylic acid methyl ester (0.46 g, 2.6 mmol, 1 eq, prepared according to the reported procedure (Anderson et al. Journal of Heterocyclic Chemistry 1981, 18, 1149-1152) in toluene was added and the reaction allowed to reach room temperature. Upon reaction completion, after about 20 minutes, the mixture was cooled down to 0° C. and HCl 2N was added to pH 2. The organic phase was recovered, dried over Na2SO4 and concentrated under reduced pressure, affording the title product which was used without further purification in the following step.

Provenance & Evidence