Water → Propan-2-yl 3-cyclopentyl-1-methyl-1H-indole-6-carboxylate

Participants

Reaction Conditions

Reaction Steps

The mixture of methyl 3-cyclopentyl-1-methyl-1H-indole-6-carboxylate (50.0 g, 0.194 mol) and lithium isopropoxide (16.2 g, 95%, 0.233 mol) in 2-propanol was stirred at 65±5° C. for at least 30 min for complete trans-esterification. The batch was cooled to 40±5° C. and water (600 g) was added at a rate to maintain the batch temperature at 40±5° C. After addition, the mixture was cooled to 20-25° C. over 2±0.5 h and held at 20-25° C. for at least 1 h. The batch was filtered and rinsed with 28 wt % 2-propanol in water (186 g), and water (500 g). The wet cake was dried in vacuo (≦200 Torr) at 40-45° C. until the water content was ≦0.5% to give isopropyl 3-cyclopentyl-1-methyl-1H-indole-6-carboxylate (52.7 g, 95% yield) in 99.2 A % (240 nm).

Provenance & Evidence