Acetic Acid → 1-Ethyl-3-hydroxy-5-methyl-3-(3,4,5-trimethoxybenzyl)indolin-2-one

HRID 1523079Notes

Reaction equation

C([O:9][C:10]1([CH2:23][C:24]2[CH:29]=[C:28]([O:30][CH3:31])[C:27]([O:32][CH3:33])=[C:26]([O:34][CH3:35])[CH:25]=2)[C:18]2[C:13](=[CH:14][CH:15]=[C:16]([CH3:19])[CH:17]=2)[N:12]([CH2:20][CH3:21])[C:11]1=[O:22])(=O)C1C=CC=CC=1.O.[OH-].[K+].C(O)(=O)C>CO>[CH2:20]([N:12]1[C:13]2[C:18](=[CH:17][C:16]([CH3:19])=[CH:15][CH:14]=2)[C:10]([OH:9])([CH2:23][C:24]2[CH:29]=[C:28]([O:30][CH3:31])[C:27]([O:32][CH3:33])=[C:26]([O:34][CH3:35])[CH:25]=2)[C:11]1=[O:22])[CH3:21]

Participants

Conditions

Temperature: 130 °C

Procedure

Alternative route: To an oven dried Biotage microwave vial cooled under argon was added 1-ethyl-5-methyl-2-oxo-3-(3,4,5-trimethoxybenzyl)indolin-3-yl benzoate (0.053 grams, 0.11 mmol). This was taken up in 0.6 mL of methanol, 0.6 mL of deionized water. A solution of KOH (223 μl, 2.0M in water) was added and the sealed vial was placed in the microwave and heated to 130° C. for 12 minutes, and 18 minutes at 140° C. Upon cooling the solution was neutralized with a stoichiometric amount of glacial acetic acid (Fisher scientific), and concentrated. Purification on a Teledyne ISCO using a C18 reverse phase column (water with 0.1% formic acid/acetonitrile gradient) afforded the desired compound. 85% yield. 1H NMR 7.22 (s, 1H), 7.08 (d, 1H), 6.55 (d, 1H), 6.06 (s, 2H), 4.38 (bs, OH), 3.72 (s, 3H), 3.66 (m, 1H), 3.61 (s, 6H), 3.34 (m, 1H), 3.23 (d, 1H), 3.17 (d, 1H), 2.35 (s, 3H), 0.87 (t, 3H). Calculated mass for C21H25NO5, 371.43. Observed 394.1 (M+Na)

Workup

customAlternative route: To an oven dried Biotage microwave
temperaturevial cooled under argon
custom18 minutes
customat 140° C
temperatureUpon cooling the solution
concentrationconcentrated
customPurification on a Teledyne ISCO

Sources & evidence

ORD record: ord-c3702aa8d9ad47ac9c0e43d109ceb312
Source dataset: uspto-grants-2015_07
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09079853B2

Reaction notes

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