(E)-tert-butyl 3-(6,6-dimethyl-7-oxo-5,6,7,8-tetrahydro-1,8-naphthyridin-3-yl)acrylate → (E)-3-(6,6-dimethyl-7-oxo-5,6,7,8-tetrahydro-1,8-naphthyridin-3-yl)acrylic acid

Participants

Reaction Conditions

Reaction Steps

To a stirred solution of (E)-tert-butyl 3-(6,6-dimethyl-7-oxo-5,6,7,8-tetrahydro-1,8-naphthyridin-3-yl)acrylate (W) (1.2 g, 3.97 mmol) in CH2Cl2 (10 mL) was added trifluoro acetic aid (5 mL) at 20-35° C. and the reaction mixture was allowed to stir at 20-35° C. for 3 h. Then the reaction mixture was rotary evaporated under vacuum to get residue which was triturated with diethyl ether to get the desired compound as an off-white solid (700 mg, 77%); 1H NMR (400 MHz, DMSO-d6) δ 10.66 (s, 1H), 8.37 (d, J=2.0 Hz, 1H), 8.01 (s, 1H), 7.55 (d, J=16.1 Hz, 1H), 6.51 (d, J=15.6 Hz, 1H), 2.80 (s, 2H), 1.08 (s, 6H).

Provenance & Evidence