1,1'-(9,9-Dimethyl-9H-xanthene-4,5-diyl)bis(1,1-diphenylphosphine) → HCID 59371456, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of 3-bromo-5-[[1-(tert-butoxycarbonyl)-2(R)-pyrrolidinyl]methoxy]pyridine (118 mg, 0.33 mmol) and 4-[2-(2-phenylethoxy)ethyl]piperidine (77 mg, 0.33 mmol) in anhydrous toluene (2 mL) were added successively sodium tert-butoxide (48 mg, 0.50 mmol, 1.5 equiv.), tris(dibenzylideneacetone)dipalladium(0) (6.1 mg, 6.6 μmol, 0.02 equiv.), and 4,5-bis(diphenylphosphino)-9,9-dimethylxanthene (Xantphos; 11.5 mg, 20 μmol, 0.06 equiv.). The mixture was degassed and purged with Ar (3 cycles), then warmed to 98-100° C. for 4 h. After cooling to room temperature, the mixture was diluted with EtOAc, and the solution was washed with brine, dried over Na2SO4, and evaporated. The residue was purified by CC on SiO2 with CH2Cl2/EtOAc 4:1, then 1:1. 3-[[1-(tert-Butoxycarbonyl)-2(S)-pyrrolidinyl]methoxy]-5-[4-[2-(2-phenylethoxy)ethyl]-1-piperidinyl]pyridine (96 mg, 57%) was obtained as a pale-yellow oil.

Provenance & Evidence