1,1'-(9,9-Dimethyl-9H-xanthene-4,5-diyl)bis(1,1-diphenylphosphine) → 1-(3-tert-butoxy-4-nitrophenyl)-3,4-difluoro-1H-pyrrole

참여 물질

반응 조건

반응 단계

A suspension of 4-bromo-2-(tert-butoxy)-1-nitrobenzene (13.7 g), 3,3,4,4-tetrafluoropyrrolidine hydrochloride (9.87 g), Pd2(dba)3 (0.916 g), Xantphos (2.31 g) and sodium tert-butoxide (19.2 g) in 1,4-dioxane (150 mL) was stirred at 90° C. for 4 hr under an argon atmosphere. The reaction mixture was poured into water, and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (NH, hexane/ethyl acetate), and recrystallized from hexane/ethyl acetate to give the title compound (8.35 g).

출처 및 근거