Potassium Carbonate → HCID 86669254, compound

Participants

Reaction Conditions

Reaction Steps

1-Methylethyl((cis)-1-acetyl-6-bromo-2-methyl-1,2,3,4-tetrahydro-4-quinolinyl)carbamate (for a preparation see Example 61) (100 mg, 0.271 mmol) were dissolved in ethanol (1 mL) and Toluene (1 mL), mixed with potassium carbonate (74.9 mg, 0.542 mmol), 2,4-dimethyl-5-(4,4,5,5-tetramethyl-1,3,2-dioxaboroian-2-yl)-1,3-thiazole (78 mg, 0.325 mmol, available from Maybridge), followed by tetrakis(triphenylphosphine)palladium(0) (15.65 mg, 0.014 mmol) and refluxed under nitrogen at 90° C. for 18.5 hours reaction time. The reaction mixture was partitioned between distilled water (40 mL) and EtOAc (40 mL). The organic and aqueous layers were run off and the latter extracted twice more using EtOAc (2×40 mL). Organic fractions were combined, dried (brine (80 mL) and sodium sulfate), filtered and evaporated to dryness to give a pale white solid (0.123 g). This was purified on a 25+M Biotage silica column, eluting with cyclohexane:EtOAc (1:0 to 1:3). Product-containing fractions were evaporated to dryness to give a clear, colourless solid which was repurified on a 12+M column using the same solvent system. Analysis of the product still showed contamination and it was further purified using MDAP. Product-containing fractions were evaporated to dryness to give a clear, colourless solid (41 mg). LCMS (Method C): Rt=0.76, MH+=402

Provenance & Evidence