p-Toluenesulfonic acid → HCID 21717544, compound

Participants

Reaction Steps

To a solution of tert-butyl-4-oxo-1-piperidine carboxylate (8.0 g, 40 mmol) and morpholine (3.6 g, 42 mmol) in benzene (16 mL) was added p-toluenesulfonic acid (40 mg) and the resulting solution was refluxed using a Dean-Stark trap for 24 h. After cooling to rt, the solution was concentrated under vacuum to afford the title compound a as a thick reddish-orange oil which was used without any further purification (11.1 g, ˜quant). 1H NMR (400 MHz, CDCl3): δ 7.36 (s, 1 H), 3.94 (br s, 2 H), 3.74 (m, 4 H), 3.54 (m, 2 H), 2.80 (m, 4 H), 2.16 (br s, 2 H), 1.47 (s, 9 H).

Provenance & Evidence