1,10-Phenanthroline → (4R)-6-(4-chlorophenyl)-1,4-dimethyl-8-(5-methyl-1,2,4-triazol-1-yl)-4,5-dihydro-[1,2,4]triazolo[3,4-d][1,5]benzodiazepine

Participants

Reaction Conditions

Reaction Steps

A mixture of (R)-8-bromo-6-(4-chlorophenyl)-1,4-dimethyl-5,6-dihydro-4H-benzo[b][1,2,4]triazolo[4,3-d][1,4]diazepine (60 mg, 0.15 mmol), 3-methyl-1H-1,2,4-triazole (14 mg, 0.16 mmol), copper (I) iodide (6 mg, 0.03 mmol), 1,10-phenanthroline (11 mg, 0.06 mmol) and cesium carbonate (98 mg, 0.3 mmol) in dimethyl sulfoxide (3 mL) was heated at 130° C. for 30 minutes under microwave (pressure: 1.0 bar, equipment power: 150 W). The reaction mixture was diluted with ethyl acetate (20 mL) and washed with brine (10 mL×3). The organic phase was dried over anhydrous sodium sulfate and then filtered. The filtrate was concentrated to give a crude product which was purified by column chromatography (silica gel, dichloromethane/methanol=20:1) to afford (R)-6-(4-chlorophenyl)-1,4-dimethyl-8-(5-methyl-1H-1,2,4-triazol-1-yl)-5,6-dihydro-4H-benzo[b][1,2,4]triazolo[4,3-d][1,4]diazepine (15 mg, 25%) and (R)-6-(4-chlorophenyl)-1,4-dimethyl-8-(3-methyl-1H-1,2,4-triazol-1-yl)-5,6-dihydro-4H-benzo[b][1,2,4]triazolo[4,3-d][1,4]diazepine (8 mg, 13%) as a light yellow solid.

Provenance & Evidence