Sodium Hydroxide → 3-Ethoxyisoquinoline-4-carboxylic acid

Participants

Reaction Conditions

Reaction Steps

The title compound of Step B (492 mg, 2 mmol) dissolved in MeOH (15 mL) was added NaOH(aq) 2M (2.5 mL). The reaction mixture was stirred at 60° C. for 16 h and then NaOH(aq) 4M (2 mL) was added and the mixture was stirred at 70° C. for 4 h. MeOH was evaporated and the aqueous phase was cooled to 0° C. and acidified with the addition of HCl(aq) 6N. The solid was filtered, washed with cold water and dried to afford the title compound (285 mg, 65%). MS (ESI) mass calcd. for C12H11NO3, 217.1. m/z found 218.1 [M+H]+. 1H NMR (400 MHz, DMSO-d6) δ 13.36 (s, 1H), 9.15 (s, 1H), 8.13-8.06 (m, 1H), 7.82-7.70 (m, 2H), 7.54-7.47 (m, 1H), 4.50 (q, J=7.0 Hz, 2H), 1.35 (t, J=7.0 Hz, 3H).

Provenance & Evidence