2-Dicyclohexylphosphino-2',4',6'-triisoprophylbiphenyl → tert-Butyl 5-(benzyloxy)-2-{(1-[4'-({[tert-butyl(dimethyl)silyl]oxy}methyl)biphenyl-4-yl]piperidin-4-yl}methyl)-6-methylpyrimidine-4-carboxylate

Participants

Reaction Steps

tert-Butyl 5-(benzyloxy)-6-methyl-2-(piperidin-4-ylmethyl)pyrimidine-4-carboxylate hydrochloride (1.0 g, 2.3 mmol), [(4′-bromobiphenyl-4-yl)methoxy](tert-butyl)dimethylsilane (0.92 g, 2.4 mmol), sodium tert-butoxide (0.67 g, 7.0 mmol), 2-dicyclohexylphosphino-2′,4′,6′-triisopropylbiphenyl (X-PHOS) (0.11 g, 0.23 mmol) and tris(dibenzylideneacetone)dipalladium (0.11 g, 0.12 mmol) were suspended in toluene (50 mL), followed by heating to reflux for 3 hours under a nitrogen atmosphere. The reaction solution was cooled to room temperature, and filtered with celite, and subsequently the filtrate was concentrated under reduced pressure. The resulting residue was purified by chromatography on a silica gel column (Moritex Corporation, elution solvent: hexane/ethyl acetate), and a fraction corresponding to the Rf value=0.50 (hexane/ethyl acetate=2/1) by thin layer chromatography was concentrated under reduced pressure to afford the title compound (0.98 g, 1.4 mmol) as a yellow oil (yield 61%).

Provenance & Evidence