Tetrahydrofuran → HCID 22660678, compound

HRID 392795Notes

Reaction equation

[CH2:1]([Li])[CH2:2][CH2:3][CH3:4].[C:6]12(CCC(=O)[CH2:17][CH2:16]1)[C:14]1[C:9](=[CH:10][CH:11]=[CH:12][CH:13]=1)[C:8](=O)[O:7]2.[Cl-].[NH4+].[O:24]1CCCC1>[Br-].C[P+](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1>[CH2:4]=[C:3]1[CH2:17][CH2:16][C:6]2([C:14]3[C:9](=[CH:10][CH:11]=[CH:12][CH:13]=3)[CH2:8][O:7]2)[CH2:1][C:2]1=[O:24]

Participants

Conditions

Temperature: -78 °C

Procedure

A suspension of methyltriphenylphosphonium bromide (715 mg) in anhydrous tetrahydrofuran (7.0 mL) was cooled to 0° C. under an atmosphere of nitrogen, to which n-butyllithium (1.53M solution in hexane, 1.3 mL) was added, stirred at that temperature for 20 minutes and then cooled to −78° C. A solution of spiro[cyclohexane-1,1′(3′H)-isobenzofuran]-3′,4-dione (216 mg) in anhydrous tetrahydrofuran (3 mL) was added to the reaction mixture and the temperature was raised to 0° C. After stirring for 20 minutes, aqueous ammonium chloride was added to thus obtained mixture and the resulting crude product was extracted with ethyl acetate. The organic layer was washed with saturated saline solution, then dried over anhydrous Na2SO4 and concentrated. The residue was purified by column chromatography on silica gel (hexane/ethyl acetate=4/1) to give the subject compound (196 mg).

Workup

additionwas added
temperaturethe temperature was raised to 0° C
stirringAfter stirring for 20 minutes
extractionthe resulting crude product was extracted with ethyl acetate
washThe organic layer was washed with saturated saline solution
dry with materialdried over anhydrous Na2SO4
concentrationconcentrated
customThe residue was purified by column chromatography on silica gel (hexane/ethyl acetate=4/1)

Sources & evidence

ORD record: ord-fbb8a0fa7307453d9d6f6939040f1733
Source dataset: uspto-grants-2004_10
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US06803372B2

Reaction notes

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