1,4-Dioxane → 7-[(R)-1-(2,6-Dichloro-3-fluorophenyl)-ethoxy]-3-pyridin-2-ylfuro[3,2-c]pyridin-6-ylamine

Participants

Reaction Conditions

Reaction Steps

A mixture of 3-bromo-7-[(R)-1-(2,6-dichloro-3-fluorophenyl)-ethoxy]-furo[3,2-c]pyridin-6-ylamine (49.0 mg, 0.117 mmol), KF (44 mg, 0.75 mmol), and Pd(PPh3)4 (13 mg, 0.011 mmol) in 1,4-dioxane (1.0 mL, 13 mmol) in a microwave reactor vial was evacuated and refilled with nitrogen (3×). 2-(1,1,1-Tributylstannyl)pyridine (90% pure; 60 μL, 0.17 mmol) was added, and the reaction mixture was heated to 100° C. for 45 min. Further 2-(1,1,1-tributylstannyl)pyridine (90% pure; 30 μL, 0.083 mmol) was added, and the reaction mixture was heated to 100° C. for a total of 2 h. The reaction mixture was diluted with DCM and washed with water. The DCM solution was washed with brine, dried over MgSO4, filtered, and concentrated. The residue was redissolved in MeOH and pre-purified by passing through a thiol SPE cartridge (500 mg/6 mL, PL-Thiol MP SPE+). The material from the thiol SPE treatment was chromatographed on a SCX column (1 g/6 mL cartridge), and the fraction that eluted with NH3/MeOH was concentrated and chromatographed on silica gel [10 g/70 mL cartridge, eluting with DCM→10% EtOAc in DCM→15% EtOAc in DCM→20% EtOAc in DCM→30% EtOAc in DCM]. Fractions containing product were combined and concentrated in vacuo to give the title compound as a foam. 1H NMR (CDCl3, 400 MHz): δ=8.69 (d, J=5.6 Hz, 1H), 8.68 (s, 1H), 7.94 (s, 1H), 7.75 (dd, J=7.6, 7.6 Hz, 1H), 7.62 (d, J=7.6 Hz, 1H), 7.29 (dd, J=8.4, 4.4, Hz, 1H), 7.23 (dd, J=7.2, 5.6 Hz, 1H), 7.05 (dd, J=8.4, 8.0 Hz, 1H), 6.56 (q, J=6.8 Hz, 1H), 4.78 (brs, 2H), 1.89 (d, J=6.8 Hz, 3H). MS (ES+): m/z=417.94/419.91/421.93 (100/80/15) [MH+], 228.03 (19) [MH+−3-F-2,6-di-Cl-Ph-CH═CH2]. HPLC: tR=3.27 min (polar—5 min, ZQ3).

Provenance & Evidence