3-bromo-5-[[1-(tert-butoxycarbonyl)-2(R)-pyrrolidinyl]methoxy]pyridine → 3-[[1-(tert-Butoxycarbonyl)-2(S)-pyrrolidinyl]methoxy]-5-[4-[2-(4-fluorobenzyloxy)ethyl]-1-piperidinyl]pyridine

関与物質

反応条件

反応手順

To a solution of 3-bromo-5-[[1-(tert-butoxycarbonyl)-2(R)-pyrrolidinyl]methoxy]pyridine (264 mg, 0.74 mmol) and 4-[2-(4-fluorobenzyloxy)ethyl]piperidine (193 mg, 0.81 mmol, 1.1 equiv.) in anhydrous toluene (4 mL) were added successively sodium tert-butoxide (106 mg, 1.11 mmol, 1.5 equiv.), tris(dibenzylideneacetone)dipalladium(0) (13.5 mg, 15 μmol, 0.02 equiv.), and 4,5-bis(diphenylphosphino)-9,9-dimethylxanthene (Xantphos; 25.6 mg, 44 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-(4-fluorobenzyloxy)ethyl]-1-piperidinyl]pyridine (305 mg, 80%) was obtained as a pale yellow oil.

情報源と証拠