2-Mepp → HCID 17975413, compound

Participants

Reaction Steps

A solution of 1-[3-(4-chloro-3-nitro-phenyl)-1-oxiranylmethyl-1,4,6,7-tetrahydro-pyrazolo[4,3-c]pyridin-5-yl]-ethanone (0.754 g, 2.0 mmol) in dichloromethane (10 mL) was treated with ytterbium(III) triflate (0.25 g, 0.40 mmol) and 1-(2-methylphenyl)-piperazine (0.705 g, 4.0 mmol) at room temperature. The reaction mixture was stirred at room temperature for 16 h and diluted with dichloromethane (100 mL) and water (50 mL). The organic layer was separated, washed with water (2×50 mL), dried over sodium sulfate and concentrated under reduced pressure. The residue was purified by column chromatography (silica, 5% MeOH/CH2Cl2) to afford 0.98 g (90%) of the desired product as a light yellow solid. MS (electrospray): m/z 553.2 (553.2, calculated for C28H33ClN6O4, [M+H]+). 1H NMR (CDCl3, 400 MHz, a mixture of two rotamers): 8.25-8.15 (m, 1H), 7.75-7.70 (m, 1H), 7.63-7.55 (m, 1H) 7.20-7.10(m, 2H), 7.05-6.95 (m, 2H), 4.90-4.70 (m, 1H), 4.65 (s, 1H), 4.30-4.15 (m, 2H), 4.10-3.70 (m, 4H), 3.00-2.40 (m, 12H), 2.20(s, 3H), 2.15 (s, 1.5H), 2.10 (s, 1.5H).

Provenance & Evidence