Sodium hydride → [3-(1-Benzyl-3-carbamoylmethyl-2-ethyl-1H-indol-5-yloxy)-propyl]-phosphonic acid dimethyl ester

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Reaction Steps

5-Hydroxy-2-ethyl-1-(phenylmethyl)-1H-indole-3-acetamide (308 mg, 1.0 mmol) was added to 40 mg (1.0 mmol) of NaH/mineral oil (washed with hexanes) in 4 mL of DMF, stirred 0.5 hours, 196 mg (0.85 mmol) of (3-bromopropyl) phosphonic acid dimethyl ester added and stirring maintained for 6.5 hours. The mixture was diluted with water, extracted with ethyl acetate, the ethyl acetate washed with brine, dried (MgSO4) and concentrated. The residue was chromatographed on silica gel eluting with EtOAc, 5% MeOH/EtOAc, then 10% MeOH/EtOAc to give 269 mg (59% yield) of [3-[[3-(2-amino-2-oxoethyl)-2-ethyl-1-(phenylmethyl)-1H-indol-5-yl]oxy]propyl]phosphonic acid dimethyl ester.

Provenance & Evidence