Pyridine, 2,4,6-trichloro- → HCID 90016257, compound

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Reaction Steps

To a stirring solution of 2,4,6-trichloropyridine (4.65 g, 24.7 mmol) and tetrahydropyran-4-carbonitrile (2.29 g, 20.6 mmol) in THF (100 mL, 0.2 M) and under nitrogen at −78° C. was added lithium bis(trimethylsilyl)amide (29 mL, 29 mmol, 1.0 M in THF) and after 5 min, the cooling bath was removed. After stirring a further 40 min, the reaction was quenched by the addition of sat. aq. NH4Cl and then concentrated. The mixture was extracted with CH2Cl2 and organics dried over MgSO4. Following concentration, the residue was purified by flash column chromatography (100:0-70:30 heptanes/EtOAc) but care needed to be taken to prevent compound precipitation on the column. After purification, 4-(2,6-dichloro-4-pyridyl)tetrahydropyran-4-carbonitrile was obtained a white solid (3.75 g, 71%); 1H NMR (400 MHz, CDCl3) δ 7.39 (d, J=0.6 Hz, 2H), 4.17-4.05 (m, 2H), 3.93-3.84 (m, 2H), 2.15-1.99 (m, 4H).

Provenance & Evidence