Benzoyl chloride → methyl 2-(4-chlorobenzoyl)-1,2,3,4-tetrahydro-9H-pyrido[3,4-b]indole-3-carboxylate

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Reaktionsschritte

A mixture of methyl 1,2,3,4-tetrahydro-9H-pyrido[3,4-b]indole-3-carboxylate (6.9 g, 30 mmol), benzoylchloride (4.2 g, 30 mmol) and triethylamine (4.8 mL) in anhydrous THF (150 mL) was refluxed for 9 h. It was concentrated and diluted with water. The solid precipitated was collected by filtration, the solid cake was washed successfully with water and hexane and dried to give methyl 2-(4-chlorobenzoyl)-1,2,3,4-tetrahydro-9H-pyrido[3,4-b]indole-3-carboxylate, 9.0 g (82%); mp 243-244° C. (lit.19 mp 245-246° C.). 1H NMR (DMSO-d6) δ 3.10 (1H, m, CH2), 3.35 (1H, m, CH2), 3.55 and 3.65 (3H, s, COOMe), 4.41 and 5.18 (1H, d, J=17.4 Hz, NCH2), 4.51 and 4.64 (1H, d, J=16.4 Hz, NCH2), 4.88 and 5.82 (1H, d, J=5.4 Hz, CH), 6.96-6.99 (1H, m, ArH), 7.03-7.08 (1H, m, ArH), 7.25-7.32 (1H, m, ArH), 7.42-7.60 (5H, m, 5×ArH), 10.65 and 10.95 (1H, s, exchangeable NH).

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