Hydrochloric Acid → Methyl {[2-(2-Acetoxyethyl)-6,7-dichloro-2,3-dihydro-1-oxo-1H-inden-5-yl]oxy}acetate

HRID 569300Notes

Reaction equation

[C:1]([O:4][CH2:5][CH2:6][CH:7]1[CH2:15][C:14]2[C:9](=[C:10]([Cl:18])[C:11]([Cl:17])=[C:12]([OH:16])[CH:13]=2)[C:8]1=[O:19])(=[O:3])[CH3:2].C(=O)([O-])[O-].[K+].[K+].Br[CH2:27][C:28]([O:30][CH3:31])=[O:29].Cl>CN(C)C=O.O>[C:1]([O:4][CH2:5][CH2:6][CH:7]1[CH2:15][C:14]2[C:9](=[C:10]([Cl:18])[C:11]([Cl:17])=[C:12]([O:16][CH2:27][C:28]([O:30][CH3:31])=[O:29])[CH:13]=2)[C:8]1=[O:19])(=[O:3])[CH3:2]

Participants

Conditions

Temperature: 60 °C

Procedure

2-(Acetoxyethyl)-6,7-dichloro-2,3-dihydro-5-hydroxy-1H-inden-1-one (5.8 gm, 0.0191 mole), potassium carbonate (3.97 gm, 0.0287 mole), methyl bromoacetate (3.52 gm, 0.023 mole) in dry N,N-dimethylformamide (35 ml) were stirred and heated at 60° C. for 3 hours. The mixture was cooled and poured into a mixture of water and ice containing hydrochloric acid. The resulting mixture was extracted with a mixture of ether and tetrahydrofuran then methylene chloride. The combined organic extracts were washed with water, then with brine and finally dried over MgSO4. Evaporation of the solvent gave 6.9 gm of residue which was purified by column chromatography using silica (300 gm) and eluting with a 50/1 mixture of methylene chloride and tetrahydrofuran. Combining the appropriate fractions and evaporating the solvent gave 3.3 gm of product, m.p. 111°-113° C.

Workup

temperatureThe mixture was cooled
extractionThe resulting mixture was extracted with a mixture of ether and tetrahydrofuran
washThe combined organic extracts were washed with water
dry with materialwith brine and finally dried over MgSO4
customEvaporation of the solvent

Sources & evidence

ORD record: ord-7aaa239ebc3f4844824e6eaeac4ab07b
Source dataset: uspto-grants-1988_03
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US04731471

Reaction notes

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