反应详情

Dissolve (-)-acetic acid cis-4-tert-butyloxy-cyclopent-2-enyl ester (90 mg, 0.45 mmol, prepared in example 14) in THF/methanol/water (1.5/0.5/0.5 mL). Add lithium hydroxide monohydrate (23.7 mg) with stirring. After stirring for about 2 hours at room temperature, dilute the reaction with water (10 mL) and extract with tert-butyl methyl ether. Combine the organic phases, dry over anhydrous magnesium sulfate, filter and concentrate under vacuum. Purify the residue by flash chromatography (silica gel, 2 g, 40% diethyl ether/hexane, 1.5×2.5 cm column) to provide the title compound (71 mg, quantitative yield, 76% ee) as a pale yellow oil, [α]20 D =+14.6°, (c=1.03, chloroform).

1. additiondilute
2. extractionextract with tert-butyl methyl ether
3. dry with materialdry over anhydrous magnesium sulfate
4. filtrationfilter
5. concentrationconcentrate under vacuum
6. customPurify the residue by flash chromatography (silica gel, 2 g, 40% diethyl ether/hexane, 1.5×2.5 cm column)