Diisopropylethylamine → HCID 86618547, compound

Participants

Reaction Steps

A solution of 2,4-dichloro-5-fluoro-pyrimidine (1.28 g, 7.68 mmol, 1.0 equiv; commercially available), 4-amino-piperidine-1-carboxylic acid tert-butyl ester (2.0 g, 10.0 mmol, 1.3 equiv) and N-ethyl diisopropylamine (3.0 mL, 2.3 g, 17.7 mmol, 2.3 equiv) in acetonitrile (16 mL) was heated by microwave irradiation to 160° 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 2.23 g (88%) of the title compound. 1H NMR (400 MHz, DMSO): δ 1.38-1.48 (m, 2H), 1.41 (s, 9H), 1.78-1.82 (m, 2H), 2.84 (br s, 2H), 3.93-3.96 (m, 2H), 4.00-4.08 (m, 1H), 8.02 (d, J=6.0 Hz, 1H), 8.09 (d, J=4.0 Hz, 1H). 13C NMR (100 MHz, DMSO): δ 28.06, 30.75, 43.33, 47.34, 78.66, 139.86 (d, J=20.3 Hz), 145.03 (d, J=255.7 Hz), 152.63 (d, J=13.4 Hz), 153.49 (d, J=2.7 Hz), 153.83. MS (ISP): 331.3 [M+H]+.

Provenance & Evidence