Trifluoroacetic acid → Trifluoroacetic acid

Participants

Reaction Steps

To a solution of 281 dissolved in dichloromethane (2 mL) was added trifluoroacetic acid (200 μl) and triethylsilane (400 μl). The reaction mixture was stirred at room temperature for ½ hours under an inert atmosphere then concentrated in vacuo. The residue was triturated with diethyl ether/hexane (1/1) to afford 2-[7-(4-fluoro-benzyl)-9-hydroxy-8-oxo-7,8-dihydro-6H-pyrrolo[3,4-g]quinolin-5-yl]-benzoic acid ethyl ester 282, TFA salt, (2.5 mg) as a yellow solid: 1H NMR (CD3OD) δ 8.9 (d, 1H), 8.0 (d, 1H), 8.0 (s, 1H), 7.8-7.6 (m, 3H), 7.5 (dd, 1H), 7.3 (m, 2H+1H), 7.0 (t, 2H), 4.7 (dd, 2H), 4.1 (dd, 2H), 3.7 (m, 2H), 0.6 (t, 3H); MS: 457 (M+1).

Provenance & Evidence