The invention discloses a synthetic method of
celecoxib. The synthetic method is characterized by comprising the following steps: firstly, adding
sodium methylate as an
aldol condensation catalyst and methylbenzene as a reaction
solvent into a reaction container, adding p-methylacetophenone and
trifluoroacetic acid ethyl ester, fully reacting, adding diluted
hydrochloric acid, and separating out a
water layer to obtain a methylbenzene solution of an intermediate-
diketone; secondly, adding water, a
phase transfer catalyst and 4-aminosulfophenyl hydrazine
hydrochloride into the methylbenzene solution of the intermediate-
diketone, and performing
dehydration cyclization reaction to obtain a
celecoxib reaction solution; thirdly, replenishing methylbenzene, standing, separating out the
water layer and remaining an
organic layer; cooling the
organic layer, preserving heat and crystallizing to obtain a
crystal product, and performing suction
filtration, methylbenzene washing and
water washing in sequence to obtain a
celecoxib crude product;
drying the crude product in vacuum, decolorizing and re-crystallizing to obtain a celecoxib
raw material. According to the synthetic method, the celecoxib yield is increased, the reaction time is shortened, the celecoxib purity is high, the three-waste
discharge in the whole production process is reduced, and the production cost is low.