Sodium Carbonate → (R)-tert-Butyl 2-((2-chloro-5-(4-methoxyphenyl)pyridin-4-ylamino)methyl)morpholine-4-carboxylate

Participants

Reaction Conditions

Reaction Steps

NaH (0.024 g, 0.569 mmol) was added to a solution of 2-chloro-5-iodopyridin-4-amine (0.121 g, 0.474 mmol) in DMF (2.8 mL) at room temperature and stirred for 10 min. The temperature was raised to 80° C. and (R)-tert-butyl 2-(tosyloxymethyl)morpholine-4-carboxylate (0.264 g, 0.711 mmol) in DMF (0.6 mL) was added. The reaction mixture was stirred for 2 h before further NaH (0.024 g, 0.569 mmol) was added at room temperature. The reaction mixture was heated at 80° C. for a further 1 h then cooled. Water was added and the mixture was partitioned between ethyl acetate (20 mL) and aq. NaHCO3 (20 mL). The organic phase was washed with brine, dried (MgSO4) and concentrated. The mixture was purified by flash column chromatography on silica gel, eluting with ethyl acetate and hexane (2/4), to give an inseparable mixture of starting material and product. LC-MS (4) Rt=2.66 min; m/z (ESI+) 397 [MH+]. A solution of the crude (R)-tert-butyl 2-((2-chloro-5-iodopyridin-4-ylamino)methyl)morpholine-4-carboxylate (0.040 g, 0.088 mmol), sodium carbonate (0.5 M, 0.26 mL), 4-methoxyphenyl boronic acid (0.013 g, 0.088 mmol) and tetrakis(triphenylphosphine) palladium(0) (0.011 g, 0.01 mmol) in acetonitrile (2 mL) was heated under microwave irradiation at 100° C. for 20 min. The reaction mixture was concentrated in vacuo. The mixture was purified by flash column chromatography on silica gel, eluting with ethyl acetate/hexane (1/1), to give the title compound as colorless oil (0.036 g, 94%).

Provenance & Evidence