Hydrochloric Acid → 5,6-Dichloro-2-(hexahydro-1H-7a-pyrrolizinyl)furo [3,2-b]pyridine

Participants

Reaction Steps

2,3-Dichloro-6-iodo-5-pyridinol (163 mg, 0.56 mmol) from example 25a, copper(I) iodide (20 mg, 0.10 mmol), bis(triphenylphosphine)palladium(II) chloride (20 mg, 0.030 mmol) and triethylamine (176 mL, 0.67 mmol) were combined and allowed to stir for 1 hour at ambient temperature. 7a-ethynyl-hexahydro-1H-pyrrolizine (91 mg, 0.67 mmol) in DMF (1.0 mL) was added to the reaction mixture which was then heated to 60° C. for 18 hours. After cooling to ambient temperature, 2 N aqueous HCl was added and the mixture was washed with Et2O (2×), basified with 15% NaOH solution and extracted with CH2Cl2 (2×). The CH2Cl2 phases were combined, dried (MgSO4), concentrated and the residue was chromatographed (silica gel; EtOAc/hexane, 1:3) to afford a white solid (116 mg, 70%): 1H NMR (CDCl3, 300 MHz) δ 1.83-1.97 (m, 6H), 2.20-2.31 (m, 2H), 2.67-2.77 (m, 2H), 3.18-3.25 (m, 2H), 6.71 (s, 1H), 7.78 (s, 1H); MS (CI/NH3) m/z: 297 (M+H)+.

Provenance & Evidence