Triethylamine → cyclopropylmethyl 4-((1R,2S)-2-(2-(5-(methylsulfonyl)pyridin-2-yloxy)ethyl)cyclopropyl)piperidine-1-carboxylate

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Reaction Steps

To a stirred solution of 5-(methylsulfonyl)-2-(2-((1S,2R)-2-(piperidin-4-yl)cyclopropyl)ethoxy)pyridine (Step A, Example 11; 0.30 g, 0.93 mmol) in dichloromethane (4.6 mL) under a nitrogen atmosphere was added triethylamine (0.36 mL, 2.6 mmol) and cyclopropylmethyl 2,5-dioxopyrrolidin-1-yl carbonate (0.35 g, 1.67 mmol). The resulting solution was stirred for 18 h at ambient temperature. The solution was diluted with saturated NH4Cl(aq.) (10 mL). The resulting layers were separated and the aqueous phase extracted with dichloromethane (2×30 mL). The combined organic extracts were dried over sodium sulfate, filtered and concentrated under reduced pressure. Purification of the obtained residue by CombiFlash chromatography (12 g silica gel, 0 to 25% EtOAc in heptane) provided the title compound as an off white semi-solid: 1H NMR (500 MHz, CDCl3) δ 8.72 (d, J=2.0 Hz, 1 h), 8.03 (m, 1H), 6.84 (d, J=8.5 Hz, 1H), 4.49 (m, 2H), 4.15 (m, 2H), 3.90 (d, J=7.0 Hz, 2H), 3.07 (s, 3H), 2.80-2.68 (m, 2H), 2.10 (m, 1H), 1.75 (m, 2H) 1.52 (m, 1H), 1.37-1.29 (m, 2H), 1.13 (m, 1H), 1.01-0.87 (m, 2H), 0.70-0.53 (m, 4H), 0.27 (m, 2H), −0.11 (q, J=5.0 Hz, 1H); MS (ESI) m/z 423 [M+H]+.

Provenance & Evidence