Phenylhydrazine hydrochloride → 2-methyl-2,3,4,5-tetrahydro-1H-pyrido(4,3-b)indole

Participants

Reaction Conditions

Reaction Steps

Phenyl hydrazine hydrochloride (5 g, 34.57 mmol) and 1-methylpiperidin-4-one hydrochloride (4.5 g, 30.1 mmol, 1 eq.) was dissolved in of ethanol (150 mL) and stirred at 80-90° C. for overnight. The reaction was monitored by TLC. The mixture was cooled to RT, solvent was concentrated under reduced pressure. The residue was dissolved in EtOAc, washed with saturated sodium bicarbonate solution. Organic layer was dried over anhydrous sodium sulfate and concentrated under reduced pressure to afford 3.0 g of 2-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indole. 1H NMR (CDCl3, free base) δ (ppm) 8.0 (bs, 1H), 7.4 (d, 1H), 7.35 (d, 1H), 7.2-7.0 (m, 2H), 3.7 (s, 2H), 2.9 (s, 4H), 2.6 (s, 3H).

Provenance & Evidence