Sodium Hydroxide → 7-methoxy-2-(4-methoxyphenyl)-5H-pyrido[3,2-b]indole-4-carboxylic acid

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Reaction Steps

Methyl 7-methoxy-2-(4-methoxyphenyl)-5H-pyrido[3,2-b]indole -4-carboxylate (150 mg, 0 4 mmol) was dissolved in a mixture of tetrahydrofuran (6 mL) and methanol (2 mL) and an aqueous solution of sodium hydroxide (1.0 N, 1.8 mL, 1.8 mmol) was added. After 1 hr the organic solvents were removed on the rotary evaporator and the pH of the aqueous solution was adjusted to about 3 with 6 N aqueous HCl. The resulting precipitate was collected by filtration, washed with water, and dried under vacuum in the presence of KOH to leave 7-methoxy-2-(4-methoxyphenyl)-5H -pyrido[3,2-b]indole-4-carboxylic acid (138 mg, 67% yield) as an orange solid. MS (ESI) m/z 349.1 (M+H). 1H NMR (DMSO-d6) δ ppm 11.47 (1H, s), 8.18 (1H, d, J=8.55 Hz), 8.16 (1H, s), 8.13 (2H, d, J=8.55 Hz), 7.29 (1H, d, J=1.83 Hz), 7.10 (2H, d, J=8.85 Hz), 6.94 (1H, dd, J=8.55, 1.83 Hz), 3.89 (3H, s), 3.85 (3H, s).

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