Dichloromethane → N-{2-fluoro-4-[1-fluoro-3-(pyrrolidin-1-ylcarbonyl)cyclobutyl]benzyl}-pyrrolidine hydrochloride

Participants

Reaction Conditions

Reaction Steps

A 2-L 3-neck RB flask, equipped a magnetic stirring bar, thermometer, addition funnel and nitrogen gas inlet was charged with Example 8, N-{2-fluoro-4-[1-hydroxy-3-(pyrrolidin-1-ylcarbonyl)cyclobutyl]benzyl}-pyrrolidine (43.0 g, 0.124 mol) and 1 L of anhydrous DCM under nitrogen. The mixture was cooled to −75° C. with a dry ice/acetone bath, then Deoxo-Fluor (Aldrich, 33.0 g, 27.5 mL, 0.149 mol) was added dropwise. The mixture was warmed to 0° C. and stirred for 30 min at this temperature. Then the mixture was quenched with 350 mL of sat. Na2CO3, and extracted with DCM (3×300 mL). The extract was dried over Na2SO4 and evaporated. The resulting crude oil was purified by column (silica gel, ether 60%, hexane 30%, MeOH 5%, Et3N 5%, Rf=0.37 in ether 60%, hexane 30%, MeOH 5%, NH4OH 5%) to give 29.0 g (67%) of the title compound. 1H NMR (300 MHz, CDCl3): δ 7.39 (t, J=7.64 Hz, 1H), 7.21 (d, J=7.92 Hz, 1H), 7.14 (d, J=10.9 Hz, 1H), 3.67 (s, 2H), 3.40-3.61 (m, 5H), 2.66-3.00 (m, 4H), 2.50-2.55 (m, 4H), 1.80-2.00 (m, 4H), 1.75-1.80 (m, 4H).

Provenance & Evidence