Triethylamine → 4-(2-Chloro-5-methoxy-pyrimidin-4-ylamino)-piperidine-1-carboxylic acid tert-butyl ester

Participants

Reaction Steps

A solution of 2,4-dichloro-5-methoxy-pyrimidine (0.80 g, 4.47 mmol, 1.0 equiv; commercially available from Specs Research Laboratory, The Netherlands), 4-amino-piperidine-1-carboxylic acid tert-butyl ester (1.34 g, 6.70 mmol, 1.5 equiv) and triethylamine (0.93 mL, 0.68 g, 6.70 mmol, 1.5 equiv) in acetonitrile (9 mL) and DMAc (2 mL) was heated by microwave irradiation to 120° C. for 20 min. The reaction mixture was concentrated under reduced pressure and the crude material purified by silica column chromatography using a MPLC system (CombiFlash Companion, Isco Inc.) eluting with a gradient of heptane/ethyl acetate providing 1.43 g (93%) of the title compound. 1H NMR (400 MHz, CDCl3): δ 1.28-1.49 (m, 2H), 1.40 (s, 9H), 1.93-1.98 (m, 2H), 2.85-2.92 (m, 2H), 3.80 (s, 3H), 3.97-4.02 (m, 2H), 4.06-4.12 (m, 1H), 5.22 (d, J=8.0 Hz, 1H), 7.46 (s, 1H). MS (ISP): 343.3 [M+H]+.

Provenance & Evidence