Acetic Acid → HCID 9924406, compound

Participants

Reaction Steps

970 mg C-(1H-Indol-3-yl)methylamine and 1.44 mg 4-dimethylamino-4-phenyl-cyclohexanone were dissolved in dry tetrahydrofuran (15 ml) and 1,2-dichloroethane (50 ml) under argon. Glacial acetic acid (13.2 mmol) and 1.82 g sodium triacetoxyborohydride were added to this mixture and the mixture was stirred for 72 hours at RT. For working up, the reaction mixture was concentrated, water (20 ml) and ether (30 ml) were added to the residue and the mixture was stirred vigorously. The aqueous phase was separated off, washed with ether (2×15 ml), adjusted to pH 11 with five molar sodium hydroxide solution and extracted with ethyl acetate (4×25 ml). The combined extracts were dried over sodium sulfate and filtered and the filtrate was concentrated. The crude product (2.11 g) was chromatographed over silica gel with methanol/triethylamine (199:1). 465 mg of the nonpolar diastereomer of N′-(1H-indol-3-ylmethyl)-N,N-dimethyl-1-phenyl-cyclohexane-1,4-diamine were obtained (m.p. 182-184° C.), from which the corresponding dihydrochloride was precipitated with chlorotrimethylsilane (443 μl) in 2-butanone/acetone (20 ml/50 ml) (498 mg; m.p. 164-168° C.).

Provenance & Evidence