Ethanolamine → 1-Cyclopropyl-7-[(4-fluorophenyl)methyl]-4-hydroxy-N-(2-hydroxyethyl)-2-oxo-1,2-dihydro-1,5-naphthyridine-3-carboxamide

Participants

Reaction Steps

A solution of ethyl 1-cyclopropyl-7-[(4-fluorophenyl)methyl]-4-hydroxy-2-oxo-1,2-dihydro-1,5-naphthyridine-3-carboxylate (24 mg, 0.06 mmol) and 2-aminoethanol (0.05 mL) in ethanol (1 mL) was heated in a microwave for 20 minutes. The reaction mixture was concentrated in vacuo and the residue taken up in water. The solution was acidified with 1 N HCl to a final pH˜4. The precipitate was filtered through a Teflon filter and the solids collected. This material was azeotroped with methanol to provide the title compound (16 mg, 64%) as a yellow solid. 1H NMR (400 MHz, CDCl3) δ 10.38 (s, 1 H), 8.54 (s, 1 H), 7.80 (s, 1 H), 7.17 (m, 2 H), 7.03 (m, 2 H), 4.13 (s, 2 H), 3.84 (m, 2 H), 3.62 (m, 2 H), 2.82 (m, 1 H), 1.23 (m, 2 H), 0.76 (m, 2 H); HRMS m/z calcd for C21H21N3O4F (M+H)+ 398.1517, found 398.1512.

Provenance & Evidence