1,3-Dichloro-2-butene → 6,7-Dichloro-2-(3-chloro-2-butenyl)-2,3-dihydro-5-methoxy-2-propyl-1H-inden-1-one

HRID 569277

Reaction equation

[Cl:1][C:2]1[C:10]([Cl:11])=[C:9]2[C:5]([CH2:6][CH:7]([CH2:13][CH2:14][CH3:15])[C:8]2=[O:12])=[CH:4][C:3]=1[O:16][CH3:17].[H-].[Na+].Cl[CH2:21][CH:22]=[C:23]([Cl:25])[CH3:24]>C1(C)C=CC=CC=1.CN(C)C=O>[Cl:1][C:2]1[C:10]([Cl:11])=[C:9]2[C:5]([CH2:6][C:7]([CH2:21][CH:22]=[C:23]([Cl:25])[CH3:24])([CH2:13][CH2:14][CH3:15])[C:8]2=[O:12])=[CH:4][C:3]=1[O:16][CH3:17]

Participants

Conditions

Temperature: 30 °C

Procedure

6,7-Dichloro-2,3-dihydro-5-methoxy-2-propyl-1H-inden-1-one (13.66 g, 0.05 mole) dissolved in toluene (80 ml) was added over 15 minutes with stirring under N2 to a suspension of 56% sodium hydride (2.36 g, 0.055M) in dimethylformamide (65 ml) and toluene (15 ml) at 25°. The mixture was stirred without external heat for 11/2 hours, at 50° C. for 1/2 hour and then cooled to 30° C. A solution of 1,3-dichloro-2-butene (7.81 g, 0.0625 mole) in toluene (10 ml) was added, and the mixture was heated at 50°-55° for 2 hours, poured into ice water, and extracted with diethyl ether. The organic extracts were washed with water, dried over MgSO4, concentrated under vacuum and chromatographed on silica with elution with 1/1 hexane/methylene chloride to obtain 14.5 g of product as an oil which was a mixture of cis-trans isomers.

Workup

additionwas added over 15 minutes
temperaturewithout external heat for 11/2 hours
temperaturethe mixture was heated at 50°-55° for 2 hours
extractionextracted with diethyl ether
washThe organic extracts were washed with water
dry with materialdried over MgSO4
concentrationconcentrated under vacuum
customchromatographed on silica with elution with 1/1 hexane/methylene chloride

Sources & evidence

ORD record: ord-e50b0728f67249f8b90520b3df9d302d
Source dataset: uspto-grants-1988_03
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US04731472

Linked notes

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