合成路线1

Condensation between 2-iodo-5-fluoroaniline (I) and phenylacetylene (II) under catalysis with Pd(PPh3)4, CuI and diethylamine, followed by cyclization catalyzed by CuI and CaCO3 in DMF, affords phenylindole (III), which is then coupled with 4-piperidone (IV) in H3PO4/HOAc to provide tetrahydropyridine derivative (V). Protection of (V) as its benzyloxycarbonyl derivative (VII) by reaction with acid chloride (VI), followed by hydroboration with bis-isopinocampheylborane ((-)-Ipc2BH) and H2O2 in NaOH, provides the secondary alcohol (VIII). Isolation of enantiomer (IX) is then performed by reaction of (VIII) with the acid chloride derived from (1R)-(+)-camphanic acid, separation of diastereoisomers by chromatography and hydrolysis with K2CO3 in MeOH. Treatment of (IX) with diethylaminosulfur trifluoride (DAST) in EtOAc induces a regiospecific and enantioselective rearrangement affording 3-(3-indolyl)-4-fluoropiperidine (X), which is finally converted into the desired compound by deprotection with formic acid and Pd/C.