Potassium Carbonate → 1-methylethyl [(2S,4R)-1-acetyl-2-methyl-6-(1-{2-[methyl(phenylmethyl)amino]ethyl}-1H-pyrazol-4-yl)-1,2,3,4-tetrahydro-4-quinolinyl]carbamate

Participants

Reaction Conditions

Reaction Steps

1-Methylethyl[(2S,4R)-1-acetyl-2-methyl-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1,2,3,4-tetrahydro-4-quinolinyl]carbamate (300 mg, 0.721 mmol, for a preparation see Intermediate 52), potassium carbonate (149 mg, 1.081 mmol) and 2-(4-bromo-1H-pyrazol-1-yl)-N-methyl-N-(phenylmethyl)ethanamine (317 mg, 1.078 mmol, for a preparation see Intermediate 53) were stirred in ethanol (3 mL) and toluene (3.00 mL). The mixture was degassed, tetrakis(triphenylphosphine)palladium(0) (41.6 mg, 0.036 mmol) added, the mixture degassed again and heated to reflux (90° C.) under nitrogen for 4.5 hours. The mixture was cooled to room temperature, loaded on to a 5 g SCX cartridge, eluted with MeOH (50 ml), 2M methanolic ammonia (25 ml) and the basic fractions evaporated to dryness. The residue was loaded on to a 12+M Biotage silica column and eluted with a gradient of 0 to 5% 2M methanolic ammonia in DCM. The product containing fractions were evaporated to a colourless gum (223 mg).

Provenance & Evidence