Acetic Acid → 1-ethyl-3-methyl-4-[2-(4-trifluoromethyl-phenyl)-ethyl]-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridine

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Reaction Steps

2-(2-Ethyl-5-methyl-2H-pyrazol-3-yl)-ethylamine (148 mg, 0.97 mmol) was dissolved in ethanol (3 ml) and acetic acid (116.5 mg. 1.94 mmol) was added followed by the addition of 3-(4-trifluoromethyl-phenyl)-propionaldehyde (197 mg, 0.97 mmol). The mixture was sealed and put in the microwave oven (100 Watts; 130° C., 14 bar, 6 minutes). The solvents were removed under reduced pressure and the residue was purified by prep. HPLC to give 113 mg (34.5%) of 1-ethyl-3-methyl-4-[2-(4-trifluoromethyl-phenyl)-ethyl]-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridine. LC-MS: tR=0.75 min; [M+H]+=338.22.

Provenance & Evidence