The invention belongs to the technical field of
medicine preparation, and discloses a preparation method of an IDH1
mutant inhibitor, which comprises the following steps: by taking 3-nitro-4-fluorobenzaldehyde and triethyl phosphorylacetate as raw materials, carrying out HWE reaction,
substitution reaction, hydrogenation pressurization reaction, cyclization reaction and
hydrolysis reaction in sequence to obtain (R)-3-(1-(1, 2, 3, 4-tetrahydro-2H-1, 2, 4-tetrahydro-2H-1, 2, 4-tetrahydro-2H-1, 2, 4-tetrahydro-2H-1, 2, 4-tetrahydro-2H-1, 2, 4- The preparation method comprises the following steps: firstly, preparing (R)-3-(1-(1, 2, 3, 4-tetrahydronaphthalene-1-yl)-2-((4-trifluoromethoxy) phenyl) amino)-1H-benzo [d]
imidazole-5-yl) propionic acid in a
crystal form A, and then carrying out a
crystal transformation process to prepare (R)-3-(1-(1, 2, 3, 4-tetrahydronaphthalene-1-yl)-2-((4-trifluoromethoxy) phenyl) amino)-1H-benzo [d]
imidazole-5-yl) propionic acid in a
crystal form B; wherein the crude product obtained by the HWE reaction is subjected to pulping treatment and
impurity removal, and then is used for the reaction of the next step. Compared with a direct leaching mode, the crude product pulping mode has the advantages that impurities can be better removed, the purity of an
intermediate product is improved, and the purity of the finally obtained target product is further improved.