Sodium Hydroxide → 4-{[3-chloro-4-[(2,4-difluorobenzyl)oxy]-6-methyl-2-oxopyridin-1(2H)-yl]methyl}benzoic acid

HRID 1832091Notes

Reaction equation

C[O:2][C:3](=[O:30])[C:4]1[CH:9]=[CH:8][C:7]([CH2:10][N:11]2[C:16]([CH3:17])=[CH:15][C:14]([O:18][CH2:19][C:20]3[CH:25]=[CH:24][C:23]([F:26])=[CH:22][C:21]=3[F:27])=[C:13]([Cl:28])[C:12]2=[O:29])=[CH:6][CH:5]=1.[OH-].[Na+]>CO.O1CCOCC1>[Cl:28][C:13]1[C:12](=[O:29])[N:11]([CH2:10][C:7]2[CH:6]=[CH:5][C:4]([C:3]([OH:30])=[O:2])=[CH:9][CH:8]=2)[C:16]([CH3:17])=[CH:15][C:14]=1[O:18][CH2:19][C:20]1[CH:25]=[CH:24][C:23]([F:26])=[CH:22][C:21]=1[F:27]

Participants

Conditions

Temperature: 50 °C

Procedure

Methyl-4-{[3-chloro-4-[(2,4-difluorobenzyl)oxy]-6-methyl-2-oxopyridin-1(2H)-yl]methyl}benzoate (30.4 g, 70.1 mmol) was suspended in methanol (150 mL) and dioxane (150 mL). 2.5N NaOH (30.8 mL, 77.08 mmol) was added. The resulting mixture was heated to 50° C. for 8.0 hours. The reaction was partially concentrated and the heterogenous mixture was acidified (pH 2) with 1N HCl. The precipitate was collected by filtration washing with H2O and diethyl ether to afford a white solid (29.2 g, 99%). 1H NMR (400 MHz, DMSO-d6) δ 7.88 (d, J=8.3 Hz, 2H), 7.63 (app q, J=7.9 Hz, 1H), 7.31 (dt, J=2.4, 9.9 Hz, 1H), 7.18 (app d, J=8.3 Hz, 2H), 7.17-7.12 (m, 1H), 6.60 (s, 1H), 5.35 (s, 2H), 5.27 (s, 2H), 2.28 (s, 3H). ES-HRMS m/z 420.0821 (M+H calcd for C21H17ClF2NO4 requires 420.0809).

Workup

concentrationThe reaction was partially concentrated
filtrationThe precipitate was collected by filtration
washwashing with H2O and diethyl ether

Sources & evidence

ORD record: ord-267d13311f274dbea7a3c197cbf70b57
Source dataset: uspto-grants-2006_06
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07067540B2

Reaction notes

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