Cyclopropylamine → N-Cyclopropyl-1-oxo-1,2,3,4-tetrahydroisoquinoline-4-carboxamide

HRID 705048Notes

Reaction equation

HRID 705048 reaction equation
[O:1]=[C:2]1[C:11]2[C:6](=[CH:7][CH:8]=[CH:9][CH:10]=2)[C:5]([C:12]([OH:14])=O)=[CH:4][NH:3]1.[CH:15]1([NH2:18])[CH2:17][CH2:16]1.ON1C2C=CC=CC=2N=N1.Cl.CN(C)CCCN=C=NCC>C(#N)C.C(OCC)(=O)C>[CH:15]1([NH:18][C:12]([CH:5]2[C:6]3[C:11](=[CH:10][CH:9]=[CH:8][CH:7]=3)[C:2](=[O:1])[NH:3][CH2:4]2)=[O:14])[CH2:17][CH2:16]1

Participants

7

Reactant 4

HCID 69828CyclopropylamineHCID 757711-HydroxybenzotriazoleHCID 6431611-Oxo-1,2-dihydroisoquinoline-4-carboxylic acidHCID 27239391,3-Propanediamine, N'-(ethylcarbonimidoyl)-N,N-dimethyl-, monohydrochloride

Product 1

HCID 71186398N-Cyclopropyl-1-oxo-1,2,3,4-tetrahydroisoquinoline-4-carboxamide

Reagents, catalysts & solvents 2

HCID 6342AcetonitrileSolventHCID 8857Ethyl AcetateSolvent

Procedure

2.50 g (12.30 mmol) of methyl 1-oxo-1,2-dihydroisoquinoline-4-carboxylate and 1.30 g of 10% strength palladium on carbon were suspended in an autoclave, and the mixture was hydrogenated at 70° C. and 20 bar of hydrogen for 4 h. The autoclave was vented, after which the catalyst was filtered off and the solvent was removed under reduced pressure, and the crude product was purified by chromatography (ethyl acetate: n-heptane 2:1). This gave 2.28 g (88%) of the desired methyl 1-oxo-1,2,3,4-tetrahydroisoquinoline-4-carboxylate. 1H-NMR (400 MHz, CDCl3 δ, ppm) 8.10 (d, 1H), 7.52 (t, 1H), 7.44 (t, 1H), 7.31 (d, 1H), 6.17 (br. s, 1H), 3.98 (dt, 1H), 3.88 (m, 1H), 3.29 (dd, 1H), 3.71 (s, 3H). 2.28 g (11.11 mmol) of methyl 1-oxo-1,2,3,4-tetrahydroisoquinoline-4-carboxylate were dissolved in 20 ml of tetrahydrofuran, and 20 ml of 1 N aqueous sodium hydroxide solution were added. The solution was stirred at room temperature for 8 h, the solvent was removed under reduced pressure and the residue was dissolved in ethyl acetate and 1 N hydrochloric acid. The phases were separated, the organic phase was dried over magnesium sulphate and the solvent was removed under reduced pressure. In this manner, 2.12 g (94% of theory) of the desired 1-oxo-1,2-dihydroisoquinoline-4-carboxylic acid were obtained. 1H-NMR (400 MHz, d6-DMSO δ, ppm) 12.65 (br. s, 1H), 7.94 (d, 1H), 7.83 (d, 1H), 7.51 (t, 1H), 7.41-7.35 (m, 2H), 3.89 (t, 1H), 3.68-3.54 (m, 2H). 0.200 g (1.046 mmol) of 1-oxo-1,2-dihydroisoquinoline-4-carboxylic acid were dissolved in 10 ml of acetonitrile, and 0.109 ml (1.569 mmol) of cyclopropylamine, 0.170 g (1.255 mmol) of 1-hydroxy-1H-benzotriazole and 0.221 g (1.151 mmol) of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride were added. The solution was stirred at room temperature for 8 h, diluted with ethyl acetate and the organic phase was extracted initially with saturated sodium bicarbonate solution and then with 1 N hydrochloric acid.

Workup

  1. extractionthe organic phase was extracted initially with saturated sodium bicarbonate solution

Sources & evidence

ORD record
ord-d0e1f2358cbb447d9dc493340a7aa9db
Source dataset
uspto-grants-2015_11
Patent number
US09173395B2

Reaction notes

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