Sodium Methoxide → 4-Hydroxy-8-phenoxy-isoquinoline-3-carboxylic acid methyl ester

HRID 409197Notes

Reaction equation

C([O:3][C:4](=O)[C:5]1[CH:10]=[CH:9][CH:8]=[C:7]([O:11][C:12]2[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=2)[C:6]=1[CH2:18][N:19]([CH2:30][C:31]([O:33][CH3:34])=[O:32])S(C1C=CC(C)=CC=1)(=O)=O)C.C[O-].[Na+]>CO>[CH3:34][O:33][C:31]([C:30]1[N:19]=[CH:18][C:6]2[C:5]([C:4]=1[OH:3])=[CH:10][CH:9]=[CH:8][C:7]=2[O:11][C:12]1[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=1)=[O:32]

Participants

Conditions

Temperature: 0 °C

Procedure

To a stirred solution of 2-{[methoxycarbonylmethyl-(toluene-4-sulfonyl)-amino]-methyl}-3-phenoxy-benzoic acid ethyl ester (5.07 g, 0.01 mol) in anhydrous methanol (22 mL) was added dropwise a mixture of sodium methoxide solution (30% wt, 5.6 mL) and anhydrous methanol (4 mL) at 0° C. The mixture was stirred at 0° C. for 10 minutes and then at room temperature for additional 3 h before it was concentrated in vacuo. Water was added and the pH of the slurry was adjusted with aqueous 1 N HCl to pH=10. The precipitate formed was separated by filtration, washed with water, saturated sodium bicarbonate solution, and water before it was dried in vacuo to give the title compound as a white solid (2.21 g): 1H NMR (CDCl3, 200 MHz): δ=11.73 (s, 1H), 9.21 (s, 1H), 8.06 (d, J=8.2 Hz, 1H), 7.61 (t, J=8.0 Hz, 1H), 7.40 (m, 2H), 7.13 (m, 4H), 4.10 (s, 3H).

Workup

customat 0° C
concentrationat room temperature for additional 3 h before it was concentrated in vacuo
additionWater was added
customThe precipitate formed
customwas separated by filtration
washwashed with water, saturated sodium bicarbonate solution, and water before it
customwas dried in vacuo

Sources & evidence

ORD record: ord-73ccd13d21cd45f3abdc639761f0063e
Source dataset: uspto-grants-2014_06
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08759373B2

Reaction notes

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