Indole → 3-(1-benzyl-1,2,5,6-tetrahydropyridine-3-yl)-1H-indole

Participants

Reaction Conditions

Reaction Steps

KOH (2.12 g, 37.8 mmole), indole (1.0 g, 8.54 mmole) and 1-benzyl-3-piperidone hydrochloride (4.82 g, 21.34 mmole) were suspended in methanol (20 ml) and heated for 8 hours at 65° C. under argon. Water (40 ml) was added dropwise at RT to the mixture over a period of 40 minutes. The methanol was distilled off and the aqueous phase was extracted with EE (3×20 ml). The organic phase was dried with Na2SO4 and concentrated by evaporation. 3-(1-benzyl-1,2,5,6-tetrahydropyridine-3-yl)-1H-indole was purified by chromatography with cyclohexane/EE (1:1). The product was obtained as a yellow solid in a yield of 860 mg (35%) and an m.p. of 105°-107° C.

Provenance & Evidence