Triethylamine → 3-(benzyloxy)-N-cyclobutyl-6-methyl-4-oxo-4H-pyran-2-carboxamide

HRID 420475Notes

Reaction equation

[CH2:1]([O:8][C:9]1[C:14](=[O:15])[CH:13]=[C:12]([CH3:16])[O:11][C:10]=1[C:17]([OH:19])=O)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.C(N1C=CN=C1)(N1C=CN=C1)=O.Cl.[CH:33]1([NH2:37])[CH2:36][CH2:35][CH2:34]1.CCN(CC)CC>CN(C=O)C>[CH2:1]([O:8][C:9]1[C:14](=[O:15])[CH:13]=[C:12]([CH3:16])[O:11][C:10]=1[C:17]([NH:37][CH:33]1[CH2:36][CH2:35][CH2:34]1)=[O:19])[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1

Participants

Conditions

Temperature: 50 °C

Procedure

A mixture of 3-(benzyloxy)-6-methyl-4-oxo-4H-pyran-2-carboxylic acid (2.5 g, 9.6 mmol, 1.0 equiv), 1,1′-carbonyldiimidazole (2.49 g, 15.37 mmol, 1.6 equiv) in DMF (20 mL) was stirred at 50° C. for 5 h. The mixture was cooled to room temperature. Cyclobutylamine hydrochloride (1.24 g, 11.52 mmol, 1.2 equiv) and Et3N (1.74 mL, 12.48 mmol, 1.3 equiv) was added, and the mixture was stirred overnight at room temperature. The solvent was removed under reduced pressure. Purification by chromatography (1:1 hexanes/EtOAc, then EtOAc) provided the titled compound (2.76 g, 91.56%) as a yellow solid. M.p. 69.3-71.0° C.; 1H-NMR (CDCl3, 400 MHz) δ 1.51-1.72 (m, 4H, cyclobutyl H), 2.19-2.28 (m, 2H, cyclobutyl H), 2.37 (s, 3H, CH3), 4.39-4.41 (m, 1H, CH), 5.41 (s, 2H, OCH2Ph), 6.30 (s, 1H, CH), 7.39-7.49 (m, 5H, ArH), 7.86 (br, 1H, NH), and MS (m/z) 314 (M++1), 217, 91.

Workup

temperatureThe mixture was cooled to room temperature
stirringthe mixture was stirred overnight at room temperature
customThe solvent was removed under reduced pressure
customPurification by chromatography (1:1 hexanes/EtOAc

Sources & evidence

ORD record: ord-8ae853224d534714891a808765ccfda6
Source dataset: uspto-grants-2012_01
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08097624B2

Reaction notes

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