Hydrochloric Acid → 1-Benzyl-5-cyano-8-hydroxy-2-oxo-1,2-dihydro-[1,6]naphthyridine-7-carboxylic acid methyl ester

HRID 1410799Notes

Reaction equation

[CH3:1][O:2][C:3]([C:5]1[C:14]([OH:15])=[C:13]2[C:8]([CH:9]=[CH:10][C:11](=[O:23])[N:12]2[CH2:16][C:17]2[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=2)=[C:7](I)[N:6]=1)=[O:4].[C:25]([Cu])#[N:26].C(Cl)Cl.Cl>CN(C=O)C>[CH3:1][O:2][C:3]([C:5]1[C:14]([OH:15])=[C:13]2[C:8]([CH:9]=[CH:10][C:11](=[O:23])[N:12]2[CH2:16][C:17]2[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=2)=[C:7]([C:25]#[N:26])[N:6]=1)=[O:4]

Participants

Conditions

Temperature: 120 °C

Procedure

A mixture of 1-benzyl-8-hydroxy-5-iodo-2-oxo-1,2-dihydro-[1,6]naphthyridine-7-carboxylic acid methyl ester (113 mg, 0.26 mmol) and CuCN (46 mg, 0.52 mmol) in DMF (3 mL) was heated at 120° C. for 8 min. After cooling to r.t., CH2Cl2 (50 mL) and 4 M HCl (50 mL) were added. The mixture was stirred vigorously until no more solid was present. The aqueous layer was extracted with additional CH2Cl2, and organic layers were combined, washed with water, and dried over MgSO4. After evaporating the solvent, the crude product was purified by silica gel chromatography (100% CH2Cl2) to give 54 mg of the title compound. MS: (−) m/z 334.30 (M−1).

Workup

temperatureAfter cooling to r.t.
extractionThe aqueous layer was extracted with additional CH2Cl2, and organic layers
washwashed with water
dry with materialdried over MgSO4
customAfter evaporating the solvent
customthe crude product was purified by silica gel chromatography (100% CH2Cl2)

Sources & evidence

ORD record: ord-61d58bdd38c34eab9a2bf48087dff461
Source dataset: uspto-grants-2014_12
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08921389B2

Reaction notes

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