Cyclohexylamine → 1-Benzyl-4-hydroxy-2-oxo-1,2-dihydro-[1,8]-naphthyridine-3-carboxylic Acid Cyclohexylamide

HRID 901232Notes

Reaction equation

[CH:1]1([NH2:7])[CH2:6][CH2:5][CH2:4][CH2:3][CH2:2]1.C([O:10][C:11]([C:13]1[C:14](=[O:31])[N:15]([CH2:24][C:25]2[CH:30]=[CH:29][CH:28]=[CH:27][CH:26]=2)[C:16]2[C:21]([C:22]=1[OH:23])=[CH:20][CH:19]=[CH:18][N:17]=2)=O)C>C1(C)C(C)=CC=CC=1>[CH:1]1([NH:7][C:11]([C:13]2[C:14](=[O:31])[N:15]([CH2:24][C:25]3[CH:30]=[CH:29][CH:28]=[CH:27][CH:26]=3)[C:16]3[C:21]([C:22]=2[OH:23])=[CH:20][CH:19]=[CH:18][N:17]=3)=[O:10])[CH2:6][CH2:5][CH2:4][CH2:3][CH2:2]1

Participants

Conditions

Temperature: 140 °C

Procedure

Cyclohexylamine (1.18 mL, 10.35 mmol) was added to a stirred solution of 1-benzyl-4-hydroxy-2-oxo-1,2-dihydro-[1,8]-naphthyridine-3-carboxylic acid ethyl ester (3) (1.68 g, 5.17 mmol) in xylene and heated at 140° C. for 3 h. The solution was cooled and the solvent was evaporated under vacuum. The residue was suspended in water and extracted by dichloromethane. The combined organic phase washed by water and brine, then dried over Na2SO4 and evaporated to yield 1.6 g (82%) of 1-benzyl-4-hydroxy-2-oxo-1,2-dihydro-[1,8]-naphthyridine-3-carboxylic acid cyclohexylamide (7) as white solids. MP: 143° C.; 1H-NMR (DMSO-d6): δ 1.22-1.87 (m, 10H), 3.87 (m, 1H), 5.62 (s, 2H), 7.20-7.32 (m, 5H), 7.43 (dd, J=4.6, 8.0 Hz, 1H), 8.48 (dd, J=1.5, 7.5 Hz, 1H), 8.77 (dd, J=1.5, 7.5 Hz, 1H), 10.20 (s, 1H); EIMS: 378 (M+1).

Workup

temperatureThe solution was cooled
customthe solvent was evaporated under vacuum
extractionextracted by dichloromethane
washThe combined organic phase washed by water and brine
dry with materialdried over Na2SO4
customevaporated

Sources & evidence

ORD record: ord-af111be50a574ed381f579ce34c27f96
Source dataset: uspto-grants-2008_04
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07361760B2

Reaction notes

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