Diisopropylethylamine → HCID 54402107, compound

Participants

Reaction Steps

To a mixture of Boc-β-(4-pyridyl)-L-alanine (75, 300 mg, 1.08 mmol) and NH(Me) OMe.HCl (1.2 eq., 1.30 mmol, 129 mg) in DCM (10 mL) was added HCTU (1.2 eq., 1.30 mmol, 536 mg) and DiPEA (3.5 eq., 3.78 mmol, 625 μL) and the mixture was stirred for 1 hour after which TLC analysis indicated complete conversion of starting material. The solvent was evaporated under reduced pressure en the residue was taken up in EtOAc, extracted with sat. aq. NaHCO3 (2×) and brine, dried over MgSO4 and concentrated in vacuo. The title compound was obtained after purification by column chromatography (EtOAc->2% MeOH/EtOAc) as a pale yellow solid (yield: 334 mg, 1.08 mmol, quant.). 1H NMR (400 MHz, CD3OD): δ=8.40 (d, J=4.59 Hz, 2H), 7.29 (d, J=4.88 Hz, 2H), 6.97 (d, J=7.26 Hz, 1H), 4.77-4.68 (m, 1H), 3.76 (s, 3H), 3.15 (s, 3H), 3.02 (dd, J=13.59, 4.85 Hz, 1H), 2.83-2.77 (m, 1H), 1.32 (s, 9H) ppm. 13C NMR (100 MHz, CD3OD): δ=173.49, 157.58, 149.88, 149.50, 126.48, 80.55, 62.25, 52.71, 38.03, 32.49, 28.66 ppm. [α]D23=−2.9 (c=1, MeOH). HRMS: calcd. for C15H43N3O4 [M+H]+310.17613. found 310.17615.

Provenance & Evidence