Sodium Carbonate → (3R,4S)-4-(2',4'-Dichlorobiphenyl-4-yloxy)-1-pyridin-3-yl-pentan-3-ol

Participants

Reaction Conditions

Reaction Steps

Prepared according to the method described in Example 12b) from (1S,2R)-4-[2-(tert-butyldimethylsilanyloxy)-1-methyl-4-pyridin-3-ylbutoxy]benzeneboronic acid (0.20 g, Example 11)), 1-bromo-2,4-dichlorobenzene (0.218 g), 2M aqueous sodium carbonate (0.5 ml) and tetrakis(triphenylphosphine)palladium (0) (0.020 g)in toluene (5 ml) and ethanol (2 ml). The reaction mixture was heated at 100° C. under nitrogen for 4 hours. After cooling, the solution was concentrated under reduced pressure. Concentrated hydrochloric acid (1 ml) was added to a solution of the residue in methanol (5 ml) and the suspension was stirred at room temperature for 5 hours. The mixture was concentrated under reduced pressure and the residue partitioned between diethyl ether and water. The aqueous layer was neutralised with sodium hydrogen carbonate solution (in water) and the aqueous solution was extracted with ethyl acetate. The combined organic phases were dried over anhydrous magnesium sulfate, filtered and concentrated under reduced pressure. The residue was purified by normal-phase HPLC eluting with a gradient of 0-25% ethanol in dichloromethane to give a solid (0.064 g) from which the oxalate salt was prepared (0.054 g).

Provenance & Evidence