The invention belongs to the technical field of
chemical synthesis of medicines, and particularly relates to a preparation method of a
CETP inhibitor Obicterapib. The invention provides three preparation schemes. According to the scheme I, 2-phenyl pentenoate and (R)-N-(1-phenethyl)-4-(
trifluoromethyl)
aniline are subjected to a reaction, and a target compound Obicterapib is prepared through
hydrolysis, cyclization,
acylation, asymmetric
chiral amine and other multi-step reactions; according to the second scheme, 4-halogenated benzotrifluoride reacts with (R)-3-amino valeronitrile, then
nitrile hydrolysis is carried out, the product reacts with
ethyl chloroformate, bis (
trifluoromethyl)
benzyl bromide, bis (pinacolato) diboron and ethyl 4-bromobutyrate, and finally
hydrolysis is carried out to prepare the target compound Obictapib. According to the third scheme, (R)-3-(4-
trifluoromethyl-phenyl amino)-
valeric acid is substituted by amino to obtain a compound (R)-3-[4-(trifluoromethyl) phenyl amino]-
valeric acid amide, then the compound (R)-3-[4-(trifluoromethyl) phenyl amino]-
valeric acid amide reacts with
ethyl chloroformate, bis (trifluoromethyl)
benzyl bromide, bis (pinacolato) diboron, ethyl 4-bromobutyrate and 5-
bromine-2-chloropyrimidine, and finally hydrolysis is conducted to prepare the target compound Obictapib.