Ethyl 1-cyclopropyl-7-[5-(2,4-diamino-pyrimidin-5-ylmethyl)-2,3-dimethoxy-phenylethynyl]-6,8-difluoro-4-oxo-1,4-dihydro-quinoline-3-carboxylate → Ethyl 1-cyclopropyl-7-[2-[5-(2,4-diamino-pyrimidin-5-yl-methyl)-2,3-dimethoxy-phenyl]ethyl]-6,8-difluoro-4-oxo-1,4-dihydro-quinoline-3-carboxylate

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Reaction Steps

A suspension of 342 mg of ethyl 1-cyclopropyl-7-[5-(2,4-diamino-pyrimidin-5-ylmethyl)-2,3-dimethoxy-phenylethynyl]-6,8-difluoro-4-oxo-1,4-dihydro-quinoline-3-carboxylate (Example 12a)) and 70 mg of 10% palladium-on-charcoal in 35 ml of dimethylformamide and 35 ml of acetic acid is hydrogenated at normal hydrogen pressure. After 6 hrs. the reaction mixture is filtered and the filtrate is concentrated in a high vacuum at 50°. The yellow residue is treated with 100 ml of 1N aqueous sodium hydroxide solution and extracted three times with 50 ml of methylene chloride each time. The combined organic phases are washed with 50 ml of water, dried over magnesium sulphate and concentrated. The crude product is triturated with 10 ml of hot ethyl acetate and filtered off under suction. 275 mg (80%) of ethyl 1-cyclopropyl-7-[2-[5-(2,4-diamino-pyrimidin-5-yl-methyl)-2,3-dimethoxy-phenyl]ethyl]-6,8-difluoro-4-oxo-1,4-dihydro-quinoline-3-carboxylate are obtained as a yellowish solid. M.p. 218°-220°.

Provenance & Evidence