Water → HCID 11753487, compound

Participants

Reaction Steps

Diethyl chlorophosphate (0.22 mL, 1.52 mmol) is added to a solution of 1-(4-tert-butylphenyl)-2-[4-(2-hydroxyethyl)piperazin-1-yl]-1H-indole-3-carboxaldehyde (510 mg, 1.26 mmol) and triethylamine (0.35 mL, 2.49 mmol) in tetrahydrofuran (5 mL). The resulting orange solution is stirred overnight at room temperature. Water is added and the mixture is extracted with ethyl acetate. The combined ethyl acetate layers are washed with water, with brine, dried and concentrated to give an oil that is purified by chromatography eluting with ethyl acetate and ethyl acetate-5% methanol to afford the phosphoric acid 2-{4-[1-(4-tert-butylphenyl)-3-formyl-1H-indol-2-yl]-piperazin-1-yl}-ethyl ester diethyl ester (280 mg, 68% yield) as a white powder. ESI/MS 542 (M+H)Rt 3.52 min; 1H NMR 10.13 (1H, s); 8.11 (1H, d, J=6 Hz); 7.66 (2H, d, J=6 Hz); 7.46 (2H, d, J=9 Hz); 7.19 (2H, m); 6.92 (1H, d, 9 Hz); 4.04 (6H, m); 3.33 (2H, br s); 3.26 (4H, br s); 2.49 (4H, br s); 1.36 (9H, s); 1.30 (6H, t).

Provenance & Evidence