The invention belongs to the field of
organic synthesis, and particularly relates to a synthesis method of 6-bromoimidazo[1,2-alpha]pyridyl-3-
formic acid. The method comprises the following steps: reacting N,N-dimethylformamidodimethyl
acetal with 2-amino-5-bromopyridine at 40-100 DEG C to obtain an intermediate, and reacting the intermediate with
ethyl bromoacetate at 60-160 DEG C for 3-15 hours; after the reaction finishes, cooling to
room temperature, and concentrating by rotary
evaporation to obtain an ethyl 6-bromoimidazo[1,2-alpha]pyridyl-3-
formate crude product; and under the action of an alkali, carrying out
hydrolysis reaction on the ethyl 6-bromoimidazo[1,2-alpha]pyridyl-3-
formate in a certain
solvent for 1-5 hours, neutralizing with
hydrochloric acid, filtering, washing with water, and
drying to directly obtain the 6-bromoimidazo[1,2-alpha]pyridyl-3-
formic acid pure product. The method has the advantages of accessible reaction raw materials, reasonable price, mild
reaction conditions and simple after-treatment, and is easy to operate and control; and the product has the advantages of stable quality and high purity.