Hydrochloric Acid → 6-benzyloxy-4-methoxymethyl-9{6-[N-methyl-N-(2-phenylethyl)-amino]-2-oxohexyl}9H-pyrido[3,4-b]indole-3-carboxylic acid-(1-methylethyl)-ester

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Reaction Steps

2.63 g of 6-benzyloxy-4-methoxymethyl-9H-pyrido[3,4-b]indole-3-carboxylic acid-(1-methyl-ethyl)-ester (6.5 mmol) is taken up in 50 ml of dry tetrahydrofuran and mixed for deprotonation with 235 mg of 80% sodium hydride suspension in oil (7.1 mmol). It is allowed to stir for 20 more minutes at room temperature, then 2.22 g of 6-[N-methyl-N-(2-phenylethyl)-amino]-2-oxohexylbromide (7.1 mmol)--dissolved in 10 ml of tetrahydrofuran--is added. It is stirred for 12 hours at room temperature, mixed with 5 ml of 2N aqueous hydrochloric acid and diluted with water. It is then extracted with dichloromethane, the solvent is drawn off in a vacuum, and the crude product that is obtained is chromatographed on silica gel using hexane-ethyl acetate. 4.1 g of 6-benzyloxy-4-methoxymethyl-9{6-[N-methyl-N-(2-phenylethyl)-amino]-2-oxohexyl}9H-pyrido[3,4-b]indole-3-carboxylic acid-(1-methylethyl)-ester is obtained as a brownish oil.

Provenance & Evidence