Sodium Carbonate → (2S)-4-methyl-2-({(1S)-2,2,2-trifluoro-1-[4'-(methylthio)-1,1'-biphenyl-4-yl]ethyl}amino)pentan-1-ol

Participants

Reaction Conditions

Reaction Steps

A stream of nitrogen was passed through a suspension made of the bromide from Step 3 (27.7 g), 4-(methylthio)phenylboronic acid (15.7 g), 2 M Na2CO3 (100 mL) and n-propanol (500 mL) for 15 minutes. A 1:3 mixture (3.5 g) of Pd(OAc)2 and PPh3 was then added and the reaction was warmed to 70° C. and stirred under nitrogen for 8 hours. The mixture was cooled to room temperature, diluted with ethylacetate (500 mL) and poured over water (2 L) and ice (500 g). The ethyl acetate layer was separated and the aqueous further extracted with ethyl acetate (200 mL). The combined ethyl acetate extracts were washed with 0.5 N NaOH (2×200 mL), with aqueous NH4Cl, brine and dried with magnesium sulfate. Removal of the solvent left a residue that was purified by chromatography on SiO2 using a gradient of ethyl acetate and hexanes (1:4 to 1:3) and again with acetone and toluene (1:10). The residue was dissolve in hot hexanes (200 mL) and the solution was allowed to cool to 0° C. under stirring. The obtained solid was filtered and dried to yield the title compound.

Provenance & Evidence