Methyl iodide → 2-(4-Chlorobenzoyl)-9-methyl-1,2,3,4-tetrahydro-pyrido[3,4-b]indole-3-carboxylic acid

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Reaction Steps

To a suspension of NaH (0.96 g, 40.0 mmol) in dry DMF (150 ml) was added portionwise methyl 2-(4-chlorobenzoyl)-1,2,3,4-tetrahydro-9H-pyrido[3,4-b]indole-3-carboxylate (7.3 g, 20.0 mmol) at 0° C. to 5° C. After being stirred for 15 min, iodomethane (2.8 g, 20.0 mmol) was added and the reaction mixture was stirred for additional 1 h in an ice bath. The mixture was then stirred at room temperature for 9 h. The excess of hydride was decomposed with methanol and the reaction mixture was then evaporated to dryness in vacuo. The residue was recrystallized from MeOH to give 2-(4-chlorobenzoyl)-9-methyl-1,2,3,4-tetrahydro-pyrido[3,4-b]indole-3-carboxylic acid, 5.4 g (74%); mp 262-263° C. 1H NMR (Acetic acid-d4) δ 3.18 (1H, m, CH2), 3.56 (1H, m, CH2), 3.45 and 3.68 (3H, s, NMe), 4.64 and 5.40 (1H, d, J=15.8 Hz, NCH2), 4.70 and 4.93 (1H, d, J=17.1 Hz, NCH2), 5.02 and 6.12 (1H, d, J=5.4 Hz, CH), 7.04-7.07 (1H, m, ArH), 7.15-7.18 (1H, m, ArH), 7.31-7.33 (1H, m, ArH), 7.45-7.47 (1H, m, ArH), 7.50-7.55 (3H, m, 3×ArH), 7.59-7.61 (1H, m, ArH). Anal. Calcd for (C20H17ClN2O3): C, 65.13; H, 4.65; N, 7.60. Found: C, 64.77; H, 4.79; N, 7.68.

Provenance & Evidence