tert-Butanol → 5-Benzofuranol, 4,6-bis(1,1-dimethylethyl)-2,3-dihydro-

HRID 1452346Notes

Reaction equation

CS(O)(=O)=O.[C:6]([C:10]1[C:15]2[CH2:16][CH2:17][O:18][C:14]=2[CH:13]=[CH:12][C:11]=1[OH:19])([CH3:9])([CH3:8])[CH3:7].[C:20](O)([CH3:23])([CH3:22])[CH3:21].[OH-].[Na+]>C(Cl)(Cl)Cl>[C:6]([C:10]1[C:15]2[CH2:16][CH2:17][O:18][C:14]=2[CH:13]=[C:12]([C:20]([CH3:23])([CH3:22])[CH3:21])[C:11]=1[OH:19])([CH3:9])([CH3:7])[CH3:8]

Participants

Conditions

Temperature: 0 °C

Procedure

Methanesulfonic acid (10 ml) was added dropwise, under ice cooling, to a solution consisting of 4-tert-butyl-5-hydroxy-2,3-dihydrobenzofuran [J. Org. Chem., 53, 4135 (1988); 2.84 g, 15 mmol], tert-butyl alcohol (10 g, 120 mmol) and chloroform (20 ml). After stirring at 0° C. for 15 min, the mixture was poured into ice water. The mixture was neutralized with an aqueous solution of 1N sodium hydroxide and subjected to extraction with ethyl acetate. The extracted layer was washed with a saturated aqueous solution of sodium hydrogen carbonate, dried over anhydrous magnesium sulfate and concentrated. The concentrate was purified by silica gel chromatography (n-hexane) to afford 4,6-di-tert-butyl-5-hydroxy-2,3-dihydrobenzofuran [210 mg (yield, 6%)].

Workup

extractionsubjected to extraction with ethyl acetate
washThe extracted layer was washed with a saturated aqueous solution of sodium hydrogen carbonate
dry with materialdried over anhydrous magnesium sulfate
concentrationconcentrated
customThe concentrate was purified by silica gel chromatography (n-hexane)

Sources & evidence

ORD record: ord-6d9a68f9e76046bfbfd64c2fab777aa7
Source dataset: uspto-grants-1997_02
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US05606089

Reaction notes

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