1,2-Dimethoxyethane → 4-((3S,4S)-3-Amino-4-hydroxypyrrolidin-1-yl)-N-(4-(chlorodifluoromethoxy)phenyl)-3-(5-fluoropyridin-3-yl)benzamide

Participants

Reaction Conditions

Reaction Steps

4-((3S,4S)-3-Amino-4-hydroxypyrrolidin-1-yl)-3-bromo-N-(4-(chlorodifluoromethoxy)phenyl)benzamide (Stage 245.1, 60 mg, 0.122 mmol), 3-fluoropyridine-5-boronic acid pinacol ester and Na2CO3 (0.183 mL, 0.366 mmol) were added to a vial containing DME (1 mL) under an argon atmosphere. PdCl2(dppf)-(CH2Cl2) (5.98 mg, 7.33 μmol) was added and the RM was stirred at 80° C. for 1.5 h. The RM was filtered through Hyflo® and the solvent was evaporated off under reduced pressure to give the crude product which was purified by flash chromatography (Silica gel column, DCM/MeOH, from 98:2 to 8:2). Fractions containing product were combined and the solvent was evaporated off under reduced pressure to give a residue which was suspended in DCM/n-hexane, filtered, washed with n-hexane and were purified by preparative HPLC (Condition 14). Fractions containing pure product were combined, treated with sat. aq. Na2CO3 and the MeCN was evaporated off under reduced pressure. The aq. residue was extracted with EtOAc. The combined extracts were washed with brine, dried over Na2SO4, filtered and the filtrate was evaporated off under reduced pressure to give a residue which was suspended in DCM/n-hexane 1:5 and filtered to afford the title product as a white solid. HPLC (Condition 10) tR=6.01 min, UPLC-MS (Condition 3) tR=0.84 min, m/z=493.1/495.2 [M+H]+; 1H-NMR (400 MHz, DMSO-d6) δ ppm 1.61 (br. s, 2H) 2.63-2.74 (m, 2H) 3.12 (br. s, 1H) 3.22-3.31 (m, 2H) 3.74 (br. s, 1H) 4.98 (d, J=3.52 Hz, 1H) 6.93 (d, J=8.60 Hz, 1H) 7.33 (d, J=8.99 Hz, 2H) 7.78 (d, J=9.77 Hz, 1H) 7.86 (m, J=9.00 Hz, 3H) 7.92 (dd, J=8.80, 2.15 Hz, 1H) 8.50 (s, 1H) 8.56 (d, J=2.74 Hz, 1H) 10.10 (s, 1H).

Provenance & Evidence