Sodium hydride → 4-(2-Chloro-3-methyl-pyridin-4-yloxy)-piperidine-1-carboxylic acid isopropyl ester

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Reaction Conditions

Reaction Steps

4-Hydroxy-piperidine-1-carboxylic acid isopropyl ester (0.496 mL, 2.90 mmol) was dissolved in anhydrous dimethylacetamide (DMA, 5 mL), NaH (60% oil dispersion, 116 mg, 2.90 mmol) was added and this mixture was stirred at 23° C. for 45 min, then this mixture was added dropwise to 2,4-dichloro-3-methyl-pyridine, which was dissolved in anhydrous DMA (4 mL). This mixture was stirred at 23° C. for 2 h then heated at 50° C. for 15 h, after which time the mixture was diluted with Et2O (140 mL), washed with water (14 mL), then brine twice (2×14 mL). The organic layer was separated, dried with MgSO4, and the solvent was evaporated in vacuo to give an oil which was purified by flash chromatography using hexanes-EtOAc, 75:25, v/v, then hexanes-EtOAc, 50:50, v/v, to give 4-(2-chloro-3-methyl-pyridin-4-yloxy)-piperidine-1-carboxylic acid isopropyl ester as a solid (223 mg, 27%). 1H NMR (CDCl3, 400 MHz) δ 8.09 (d, 1H), 6.69 (d, 1H), 4.91 (m, 1H), 4.60 (m, 1H), 3.61 (m, 2H), 3.52 (m, 2H), 2.24 (s, 3H), 1.91 (m, 2H), 1.80 (m, 2H), 1.24 d, 6H). LRMS calculated for C15H21ClN2O3: 312.12, Found: (MH)+ 313.4.

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