The invention discloses a method for preparing a compound 2-(imidazo [1,2-a]
pyridine-3-yl)
acetonitrile, which is a new method for preparing a key intermediate of
minodronic acid, comprising the steps of: with a compound 3- imidazo [1, 2-a]
pyridine carboxaldehyde with the formula (II) and a compound tosylmethyl
isocyanide with the formula (III) as raw materials, carrying out
chemical reaction in an
organic solvent containing glycol
dimethyl ether and an alkaline medium of
potassium tert-butoxide or
sodium tert-butoxide; separating and purifying to obtain the compound 2-(imidazo [1, 2-a]
pyridine-3-base)
acetonitrile, wherein the process of the
chemical reaction is disclosed in the specification of the invention. In the invention, by means of the method for preparing the compound with the formula (I), the reaction procedure is shortened, the technical process of the whole reaction is simplified, the use of a highly
toxic material sodium cyanide is avoided, the
operability of the reaction is strong, the yield is high, and the obtained product has high purity, lower cost, and is easy for the application in the industrialized production.