合成路线1

Treatment of acid (XXXIV) with Pmb-OH in the presence of DPPA and Et3N (through Curtius rearrangement) in refluxing toluene produces carbamate (XXXV), which is reduced at the ethyl ester group to alcohol (XXXVI) by means of NaBH4 in THF/MeOH. Activation of primary alcohol (XXXVI) using MsCl and DIEA in CH2Cl2 at 5 °C gives mesylate (XXXVII), which by treatment with KI in refluxing acetone affords its corresponding iodide (XXXVIII). Condensation of the 7-hydroxyquinoline derivative (IX) with either, mesylate (XXXVII) using K2CO3 in the presence of KI or NaI or with iodide (XXXVIII) using K2CO3 in refluxing acetone yields ether (XXXIX), which is finally deprotected by cleavement of the PMB group by treatment with TFA or p-TsOH in CH2Cl2 or acetonitrile .
Condensation of mesylate (XXXVII) with the 7-hydroxyquinoline derivative (XL) by means of K2CO3 and NaI in refluxing acetone gives ether (XLI), whose ethyl ester group is hydrolyzed with NaOH in EtOH to give acid (XLII). Finally, preactivation of acid (XLII) with CDI, followed by coupling with methylamine hydrochloride (III) in DMF at 80 °C affords amide (XXXIX) .