Diethyl Ether → 4-[3-(1-Hydroxy-cyclohexyl)-indole-1-sulfonyl]-benzoic acid methyl ester

Participants

Reaction Conditions

Reaction Steps

Via addition funnel slowly add over 0.5 hours the 2M EtOEt solution of cyclopropyl magnesium bromide (2.16 g, 6.23 ml, 12.46 mmol, 1.1 eq) to the −78° C. THF solution (30 ml) of 4-(3-Iodo-indole-1-sulfonyl)-benzoic acid methyl ester (5 g, 11.33 mmol, 1.00 eq). Stir for 2 hours and then warm to 0° C. Stir for 0.5 hours. Recool to −10° C. and then slowly add a THF solution (3 ml) of cyclohexanone (1.298 g, 13.03 mmol, 1.15 eq). Stir for 15 min and warm to room temperature. Stir for 1.5 days. Quench reaction with saturated aqueous ammonium chloride, remove organics on rotovap, and add EtOAc to crude mix. Extract product into organics, separate organics, dry over MgSO4, and concentrate on rotovap to give crude product as an oil. Purify by silica gel chromatography to give 4-[3-(1-Hydroxy-cyclohexyl)-indole-1-sulfonyl]-benzoic acid methyl ester (948 mg, 20% yield).

Provenance & Evidence