Cesium carbonate → HCID 59312584, compound

Participants

Reaction Conditions

Reaction Steps

(1S,4aR,6aS,7R,8R,10aR,10bR,12aR,14R,15R)-15-[[(2R)-2-amino-2,3-dimethylbutyl]oxy]-14-[5-(2-bromo-4-pyridinyl)-1H-1,2,4-triazol-1-yl]-8-[(1R)-1,2-dimethylpropyl]-1,6,6a,7,8,9,10,10a,10b,11,12,12a-dodecahydro-1,6a,8,10a-tetramethyl-4H-1,4a-propano-2H-phenanthro[1,2-c]pyran-7-carboxylic acid (Example 175, 10.1 mg, 0.011 mmol), 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine (29.2 mg, 0.142 mmol), palladium(II) acetate (1.8 mg, 8.02 mmol), 2-dicyclohexylphosphino-2′,4′,6′-triisopropyl-1,1′biphenyl (4.3 mg, 9.02 μmol), cesium carbonate (46.1 mg, 0.141 mmol), and 1,4-dioxane (0.5 ml) were combined in a 0.5-2 ml microwave vial. The reaction mixture was purged with nitrogen before the vial was sealed. The reaction mixture was heated at 135° C. in a microwave reactor for 30 minutes. The reaction mixture was filtered (0.45 μm syringe filter), diluted with methanol, and evaporated under reduced pressure to give a light brown residue. The residue was dissolved in methanol and purified using a single HPLC run on a 30×150 mm Sunfire Prep C18 OBD 10 μm column by eluting with acetonitrile/water+0.1% TFA. The total flow rate was 20 ml/min and the HPLC method employed a 17 minute 20%-100% acetonitrile/water gradient followed by a 2 minute acetonitrile flush. The product fractions were combined, the solvent was evaporated under reduced pressure, and the residue was lyophilized from ethanol and benzene to give the title compound (7.2 mg) as a white solid.

Provenance & Evidence