Methyl iodide → Methyl 4-[5-(N-cyclopentylmethylcarbamoyl)-1-methylindol-3-ylmethyl]-3-methoxybenzoate

Participants

Reaction Conditions

Reaction Steps

A solution of methyl 4-[5-(N-cyclopentylmethylcarbamoyl)indol-3-ylmethyl]-3-methoxybenzoate (C) (1.52 g) in N,N-dimethylformamide (5 ml) was added to a slurry of sodium hydride (0.088 g) in N,N-dimethylformamide (3 ml) at 0° C. The mixture was stirred under a nitrogen atmosphere for 20 minutes at 0° C. and for 15 minutes at 25° C. The reaction was cooled to 0° C., treated with a cold solution of iodomethane (0.57 g) in N,N-dimethylformamide (2 ml), and then allowed to warm to 25°. The mixture was recooled to 0°, quenched with saturated aqueous ammonium chloride, and evaporated. The residue was dissolved in ethyl acetate, washed with water and brine, dried (MgSO4), and evaporated. The amber residue was purified by flash chromatography on silica gel (500 ml), eluting with 1:9 v/v ethyl acetate:chloroform, to yield the title compound (0.86 g, 55%) as a white foam; partial NMR (80 MHz, CDCl 3): 3.4(dd, 2H, CH2N), 3.73(s, 3H, NCH3), 3.89(s, 3H, OCH3), 3.92(s, 3H, OCH3), 4.12(s, 2H, ArCH2), 6.11(t, 1H, NH), 6.8(s, 1H, H2 -indole), 8.00(br s, 1H, H4 -indole).

Provenance & Evidence