2-Dicyclohexylphosphino-2',4',6'-triisoprophylbiphenyl → 1,1,1,3,3,3-Hexafluoro-2-(4-(2-(3-methoxybenzyl)-4-(thiophen-2-ylsulfonyl)piperazin-1-yl)phenyl)-2-propanol

Participants

Reaction Conditions

Reaction Steps

To a 50-mL round-bottomed flask was added 3-(3-methoxybenzyl)-1-(thiophen-2-ylsulfonyl)piperazine (48 mg, 0.14 mmol), tris(dibenzylideneacetone)dipalladium (0) (6 mg, 6.81 μmol, Strem, Newburyport, Mass.), dicyclohexyl(2′,4′,6′-triisopropyl-[1,1′-biphenyl]-2-yl)phosphine (RuPhos) (13 mg, 0.027 mmol, Strem Chemicals, Newburyport, Mass.), sodium tert-butoxide (33 mg, 0.34 mmol) and 2-(4-bromophenyl)-1,1,1,3,3,3-hexafluoro-2-propanol (53 mg, 0.16 mmol, Bioorg. Med. Chem. Lett. 2002, 12, 3009) in toluene (2 mL). The reaction mixture was stirred at 100° C. for 18 h. The mixture was cooled to room temperature and then diluted with saturated aqueous NH4Cl (10 mL) and extracted with EtOAc (2×30 mL). The organic extract was washed with saturated NaCl (10 mL) and dried over Na2SO4. The solution was filtered and concentrated in vacuo to give the crude material as light-yellow oil. The crude product was purified by silica gel chromatography, eluting with 20% EtOAc in hexanes to give 1,1,1,3,3,3-hexafluoro-2-(4-(2-(3-methoxybenzyl)-4-(thiophen-2-ylsulfonyl)piperazin-1-yl)phenyl)-2-propanol (41 mg) (racemic mixture) as a colorless tar.

Provenance & Evidence