Triethylamine → 4-((3,6-difluoropyridin-2-ylamino)methyl)tetrahydro-2H-pyran-4-carbonitrile

Participants

Reaction Conditions

Reaction Steps

To 2,3,6-Trifluoropyridine (0.6 g, 4.5 mmol) in DMSO (5 ml) at room temperature was added 4-(aminomethyl)tetrahydro-2H-pyran-4-carbonitrile (Intermediate R, 1.01 g, 7.23 mmol) and triethylamine (1.57 ml, 11.24 mmol) sequentially. The light brown mixture was heated at 105° C. in a sealed glass bomb for 18 hours. After cooled to room temperature the reaction mixture was extracted with EtOAc (40 ml), washed with saturated NaHCO3 solution and brine, dried over sodium sulfate and concentrated in vacuo to give a light brown liquid. This crude material was purified by silica gel chromatography using a 12 g column, eluting with 5%-20% ethyl acetate in hexane to afford 550 mg (48.2% yield) of the desired product. LCMS (m/z): 254.1 [M+H]+; retention time=0.743 min. 1H NMR (400 MHz, CHLOROFORM-d) δ ppm 1.69-1.95 (m, 4 H) 3.60-3.82 (m, 4 H) 4.00 (ddd, J=12.13, 4.30, 1.96 Hz, 2 H) 5.02 (br. S., 1 H) 6.12 (td, J=5.58, 2.54 Hz, 1 H) 7.19-7.33 (m, 1 H).

Provenance & Evidence