合成路线1

The reaction of retinoic acid (I) with PCl3 in dry benzene gives the corresponding retinoyl chloride (II), which is then condensed with 4-aminophenol (III) in DMF - ether.

合成路线2

The condensation of 4-aminophenol (I) with 2-chloro-3-nitropyridine (II) in DMF at 100 C gives 4-(3-nitropyridin-2-ylamino)phenol (III), which is reduced with H2 over Pd/C in THF-methanol to afford 4-(3-aminopyridin-2-ylamino)phenol (IV). Finally, this compound is condensed with 4-methoxybenzenesulfonylchloride (V) by means of pyridine in THF.

合成路线3

Imine (III) was prepared by condensation of 6-methoxy-1-tetralone (I) with p-aminophenol (II) at 180 C. After silylation of the hydroxyl group of (III) with tert-butyldimethylsilyl chloride to give (IV), acylation of the enamine function with 2-bromo-5-methoxybenzoyl chloride (V) yielded enamide (VI). Halogenation of (VI) with N-bromosuccinimide gave the beta-bromo enamide (VII). Photocyclization of (VII) produced the benzophenanthridine (VIII), which was further dehydrogenated with DDQ providing (IX). Desilylation of (IX) to afford phenol (X) was achieved by treatment with hydrogen fluoride-pyridine.

合成路线4

4,5-Dimethoxy-2-nitrobenzoic acid (I) was treated with thionyl chloride to form acid chloride (II), followed by reaction with ammonia to yield 4,5-dimethoxy-2-nitrobenzamide (III). This was reduced with sodium borohydride in the presence of copper sulfate to give aminobenzamide (IV), which was refluxed with formic acid to afford 6,7-dimethoxyquinazoline-4(3H)-one (V). Subsequent treatment of (V) with phosphoryl chloride gave the chloroquinazoline (VI). The title compound was then prepared by condensation of (VI) with 4-aminophenol (VII) in refluxing ethanol.

合成路线5

The cyclocondensation of triphenylphosphite (I) with 4-(benzyloxycarbonyl-L-prolylamino)butyraldehyde (II) in hot acetic acid gives the pyrrolidinylphosphonate (III), which is deprotected by hydrogenation with H2 over Pd/C in methanol. The intermediates (I) and (II) have been obtained as follows: Phosphite (I): The acylation of 4-aminophenol (IV) with acetic acid and isobutyl chloroformate in DMF gives N-(4-hydroxyphenyl)acetamide (V), which is allowed to react with PCl3 and triethylamine in DMF yielding phosphite (I). 4-(Benzyloxycarbonyl-L-prolylamino)butyraldehyde (II): The condensation of N-(benzyloxycarbonyl)-L-proline (VI) with 4-aminobutyraldehyde diethylacetal (VII) by means of isobutyl chloroformate and triethylamine in chloroform gives 4-[N-(benzyloxycarbonyl)-L-prolylamino]butyraldehyde diethylacetal (VIII), which is hydrolyzed to the target aldehyde (II) with HCl in THF.

合成路线6

The condensation of 4-chloro-2-(2-naphthyl)quinoline (I) with p-aminophenol (II) at 130 C provided the corresponding 4-anilinoquinoline (III). Then, Mannich reaction of (III) with N-methylpiperazine (IV) and formaldehyde furnished the title compound.

合成路线7

Condensation of 4-aminophenol (I) with 4-chloropyridine (II) in the presence of potassium tert-butoxide afforded the intermediate diaryl ether (III).

合成路线8