Dichloromethane → (E)-3-(7-oxo-5,6,7,8-tetrahydro-1,8-naphthyridin-3-yl)acrylic Acid Hydrochloride

HRID 2172061Notes

Reaction equation

[OH-].[Na+].CN1CC[C:7]2([CH2:18][C:17]3[C:12](=[N:13][CH:14]=[C:15](/[CH:19]=[CH:20]/[C:21]([O:23]CC)=[O:22])[CH:16]=3)[NH:11][C:10]2=[O:26])CC1.[Cl:27]CCl>C(O)C>[ClH:27].[O:26]=[C:10]1[NH:11][C:12]2[N:13]=[CH:14][C:15](/[CH:19]=[CH:20]/[C:21]([OH:23])=[O:22])=[CH:16][C:17]=2[CH2:18][CH2:7]1

Participants

Conditions

Temperature: 45 °C

Procedure

An aqueous solution of sodium hydroxide (1N, 7.83 mL) was added to a solution of (E)-ethyl 3-(1′-methyl-2-oxo-2,4-dihydro-1H-spiro[[1,8]naphthyridine-3,4′-piperidine]-6-yl)acrylate (860 mg, 2.61 mmol) in a mixture of dichloromethane (10 mL) and ethanol (10 mL) at room temperature. The reaction mixture was stirred at 45° C. overnight then concentrated to dryness. The residue was acidified by addition of an aqueous solution of hydrochloric acid (1N, 30 mL) until pH 1. The resulting solid was filtered and washed with water and diethyl ether. The title product was obtained as a white solid (586 mg, 66%).

Workup

concentrationthen concentrated to dryness
additionThe residue was acidified by addition of an aqueous solution of hydrochloric acid (1N, 30 mL) until pH 1
filtrationThe resulting solid was filtered
washwashed with water and diethyl ether

Sources & evidence

ORD record: ord-a6d1aa871f424099b107a863f9842af1
Source dataset: uspto-grants-2015_06
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09051321B2

Reaction notes

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