Piperidine → (R)-tert-butyl 3-(piperidin-1-yl)pyrrolidine-1-carboxylate

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Reaction Conditions

Reaction Steps

A mixture of (S)-tert-butyl 3-(methylsulfonyloxy)pyrrolidine-1-carboxylate (Reference Example 5a, 12.15 g, 45.8 mmol) and piperidine (100 mL, 1.01568 mole) was stirred at 70° C. overnight. The residue was purified by silica gel chromatography (100% ethyl acetate to 97:3 ethyl acetate/methanol). Fractions containing product were combined and concentrated under reduced pressure to give (R)-tert-butyl 3-(piperidin-1-yl)pyrrolidine-1-carboxylate. 1H NMR (300 MHz, CD3OD) δ ppm 1.45 (s, 9H), 1.45-1.53 (m, 2H), 1.56-1.66 (m, 1H), 1.66-1.84 (m, 1H), 2.09-2.20 (m, 1H), 2.35-2.60 (m, 4H), 2.73-2.89 (m, 1H), 3.06 (t, J=10 Hz, 1H), 3.17-3.29 (m, 1H), 3.51 (t, J=10 Hz, 1H), 3.58-3.66 (m, 1H); MS (DCI/NH3) m/z 255 (M+H)+.

Provenance & Evidence