合成路线1

The reaction of 1-bromo-2,4,5-trifluoro-3-methoxybenzene (I) with CuCN and N-methyl-2-pyrrolidone at 150 C gives 2,4,5-trifluoro-3-methoxybenzonitrile (II), which by treatment with concentrated H2SO4 yields the benzamide (III). The hydrolysis of (III) with H2SO4 - water at 110 C affords 2,4,5-trifluoro-2-methoxybenzoic acid (IV), which by reaction with SOCl2 is converted into the acyl chloride (V). The condensation of (V) with diethyl malonate by means of magnesium ethoxide in toluene affords diethyl 2-(2,4,5-trifluoro-3-methoxybenzoyl)malonate (VI), which by treatment with p-toluenesulfonic acid in refluxing water gives ethyl 2-(2,4,5-trifluoro-3-methoxybenzoyl)acetate (VII). The condensation of (VII) with triethyl orthoformate in refluxing acetic anhydride yields 3-ethoxy-2-(2,4,5-trifluoro-3-methoxybenzoyl)acrylic acid ethyl ester (VIII), which is treated with cyclopropylamine (IX) to afford the corresponding cyclopropylamino derivative (X). The cyclization of (X) by means of NaF in refluxing DMF gives 1-cyclopropyl-6,7-difluoro-8-methoxy-4-oxo-1,4-dihydroquinoline-3-carboxylic acid ethyl ester (XI), which is hydrolyzed with H2SO4 in acetic acid to yield the corresponding free acid (XII). Finally, this compound is condensed with 2-methylpiperazine (XIII) in hot DMSO.

合成路线2

The condensation of 2,4,5-trifluoro-3-methoxybenzoyl chloride (I) with 14C-labeled diethyl malonate (II) by means of MgCl2 and TEA gives the benzoylmalonate (III), which is monodecarboxylated with TsOH in refluxing water, yielding the benzoylacetate (IV). The reaction of (IV) with triethyl orthoformate and Ac2O at 140 C affords the benzoylacrylate (V), which is treated with cyclopropylamine (VI) in cyclohexane to provide ethyl 3-(cyclopropylamino)-2-(2,4,5-trifluoro-3-methoxybenzoyl)acrylate (VII). The cyclization of (VII) by means of K2CO3 in hot N-methylpyrrolidone gives the quinolone carboxylate (VIII), which is hydrolyzed with NaOH in hot methanol, affording the carboxylic acid (IX). Finally, this compound is condensed with (S,S)-2,8-diazabicyclo[4.3.0]octane (X) by means of 1,4-diazabicyclo[2.2.2]octane (DABCO) in refluxing acetonitrile.

合成路线3

The enantioselective epoxidation of allyl alcohol (I) with 2-phenylisopropyl hydroperoxide (II) and Ti(iPrO)4 in the presence of D-diisopropyl tartrate gives the chiral epoxide (III), which is esterified with pivaloyl chloride to yield the pivalate (IV). The opening of the epoxide ring of (IV) by means of lithium acetylide (V) and BF3/Et2O affords the alkynyl alcohol (VI), which is cyclized by means of Mo(CO)6 and trimethylamine oxide to provide the chiral dihydrofuran (VII). The oxidation of (VII) with OsO4 and 4-methylmorpholine-N-oxide (NMMO) gives the diol (VIII), which is treated with Ac2O to yield the diacetate (IX). The condensation of (IX) with N6-benzoyl-N6,7-bis(trimethylsilyl)adenine (X) by means of Tms-OTf affords the nucleoside (XI). Finally, this compound is deprotected by means of NaOMe in methanol.

合成路线4