Triethylamine → 7-(2-Aminomethyl-1,4-dioxa-7-azaspiro[4.4]non-7-yl)-6-fluoro-1-(2,4-difluorophenyl)-1,8-naphthyridine-3-carboxylic acid dihydrochloride

Participants

Reaction Conditions

Reaction Steps

In a reaction similar to that of Step 1 Example 387, into oven-dried glassware maintained under dry N2 were placed 0.733 g (2.8 mmol) of 2-t-butoxycarbonylaminomethyl-1,4-dioxa-7-azaspiro[4.4]nonane, from Step 5 Example 159, 0.725 g (1.9 mmol) of 1-(2,4-difluorophenyl)-7-chloro-6-fluoro-1,8-naphthyridine-3-carboxylic acid ethyl ester dissolved in 20 mL of pyridine and 1.06 mL (7.6 mmol) of triethylamine. The reaction was stirred at 45° C. for 6 hours, then the solvent was removed in a rotary evaporator after toluene was added to azeotrope the pyridine. The residue was dissolved in 60 mL of methylene chloride, washed with 2×50 mL of water and dried over anhydrous sodium sulfate and filtered. The solvent was removed by evaporation and the product was washed with hexane and dried to afford 1.184 g of the title compound, MS (DCl) M/Z 605 (M+H). NMR (CDCl3) d 1.40 (t, 3H, J=6 Hz), 1.47 (s, 9H), 2.03 (m, 2H), 3.16 (m, 2H), 3.51 (m, 4H), 3.69 (m, 1H), 4.04 (m, 1H), 4.22 (m, 1H), 4.38 (q, 2H, J=6 Hz), 4.81 (m, 1H), 7.05 (m, 2H), 7.38 (m, 1H), 8.09 (dd, 1H, J=12, 1.5 Hz), 8.39 (d, 1H, J=1.5 Hz).

Provenance & Evidence