Piperidine → tert-butyl 5-bromo-3-[(1S)-1-(2-chloro-3-fluoro-6-hydroxyphenyl)ethyl]-1H-pyrrolo[2,3-b]pyridine-1-carboxylate

Participants

Reaction Steps

A solution of tert-butyl 5-bromo-3-[(1S)-1-{6-[(tert-butoxycarbonyl)oxy]-2-chloro-3-fluorophenyl}ethyl]-1H-pyrrolo[2,3-b]pyridine-1-carboxylate (1.982 g, 3.478 mmol) in CH2Cl2 (40 mL) was charged with piperidine (12 mL, 120 mmol) and was stirred at rt for 16 h. The reaction mixture was diluted with CH2Cl2 and washed with 0.5 N HCl (4×50 mL). The combined organic layers were washed with brine, dried over anhydrous Na2SO4, filtered, and concentrated in vacuo. The crude was adsorbed onto a pre-filled silica gel loading cartridge [RediSepRf, 5 g] and purified using the Teledyne/ISCO system [RediSepRf 24 gram silica], eluting with a 10-50% EtOAc:Heptane solvent gradient. Fractions containing the desired product were pooled together and concentrated in vacuo, yielding the title material as a white solid. 1H NMR (400 MHz, CDCl3): δ=8.39 (d, J=2.3 Hz, 1H), 7.65 (d, J=1.5 Hz, 1H), 7.54 (d, J=2.0 Hz, 1H), 6.97 (dd, J=8.8, 8.3 Hz, 1H), 6.67 (dd, J=8.8, 4.5 Hz, 1H), 4.93 (qd, J=7.1, 1.3 Hz, 1H), 1.78 (d, J=7.1 Hz, 3H), 1.68 (s, 9H). MS (ES+): m/z 412.78/414.75/416.76 (75/100/27) [MH+−C4H8]. HPLC: tR=4.13 min (ZQ3, polar—5 min).

Provenance & Evidence