Water → 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

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Reaction Steps

A solution of 200 mg of 5-[3-ethynyl-4,5-dimethoxy-benzyl]-pyrimidine-2,4-diamine (Example 11b)), 207 mg of ethyl 1-cyclopropyl-6,8-difluoro-4-oxo-1,4-dihydro-7-[[(trifluoromethyl)sulphonyl]oxy]-quinoline-3-carboxylate (J. Heterocyclic Chem., 28, 1581 (1991)) and 10 mg of bis-triphenylphosphinepalladium dichloride in 1.5 ml of triethylamine and 7.5 ml of dimethylformamide is stirred at 900 for one hr. The reaction mixture is cooled to room temperature, poured into 50 ml of water and extracted four times with 50 ml of methylene chloride each time. The combined organic phases are washed with 100 ml of saturated, aqueous sodium chloride solution, dried over magnesium sulphate and concentrated. The residue is chromatographed on silica gel with methylene chloride/methanol 9:1. 108 mg (39%) 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 are isolated as a colourless solid. M.p.>230°. Mass spectrum: peaks: inter alia at 575 (M+, 36%), 503 (18%), 481 (20%), 123 (42%), 32(100%).

Provenance & Evidence