Indole → (5-Benzyloxy-indol-1-yl)-acetic acid ethyl ester

Participants

Reaction Conditions

Reaction Steps

5-benzyloxyindole (10.0 g, 44.79 mmol) is dissolved into anhydrous DMF (100 mL) and cooled to 0° C. in an ice water bath. Sodium hydride (2.6 g, 67.18 mmol) is dissolved into anhydrous DMF (100 mL), then slowly added to the indole solution using an addition funnel. The reaction is allowed to stir at 0° C. for 1 h., then the ice bath is removed and the solution is allowed to warm slowly to room temperature. The solution is then cooled back down to 0° C. and ethyl bromoacetate (11.2 g, 67.18 mmol) is then added in one portion. The reaction is allowed to stir at 0° C. for 1 h., then the ice bath is removed and the solution is allowed to warm slowly to room temperature. Upon completion, the reaction is quenched carefully using water, then diluted with EtOAc (300 mL). Brine (100 mL) is added and the two layers are separated in a separatory funnel. The organic layer is rinsed with water (2×75 mL) and then dried over anhydrous magnesium sulfate. The organic layer is then concentrated and purified using flash column chromatography (5% EtOAc/Hexanes) to yield 11.86 g (86%) of (5-Benzyloxy-indol-1-yl)-acetic acid ethyl ester.

Provenance & Evidence