合成路线1

N-Protection of 4-aminophenylacetonitrile (I) with benzyl bromide (II) by means of K2CO3 and KI in DMF affords dibenzylamino derivative (III), which is then methylated by first treatment with lithium bis(trimethylsilyl)amide (LiN(SiMe3)2) followed by MeI in THF to provide propionitrile derivative (IV). Reduction of the cyano moiety of (IV) by means of borane methylsulfide (BH3.DMS) in refluxing THF, followed by treatment with HCl/MeOH in Et2O, yields propylamine hydrochloride (V), which is then allowed to react with isopropylsulfonyl chloride in CH2Cl2 in the presence of either DBU or Et3N to furnish isopropylsulfonamide derivative (VI). Hydrogenation of (VI) over Pd/C in EtOH in the presence of ammonium formate (NH4+COO-) allows benzyl removal to yield compound (VII), which is finally condensed with benzoyl chloride (VIII) by means of Et3N in CH2Cl2 to provide the target product. Alternatively, protection of the sulfonamide group of derivative (VI) can be performed by means of Boc2O and DMAP. Then hydrogenation of (VI) over Pd/C in EtOH in the presence of ammonium formate (NH4+COO-) allows benzyl removal, yielding compound (IX). Finally, condensation of (IX) with benzoyl chloride (VIII) by means of Et3N in CH2Cl2 followed by Boc removal by means of TFA in CH2Cl2 leads to the desired compound.