反应详情

A mixture of methyl 3-bromo-2-oxobutanoate (4.6 g) and 2-methylpropanethioamide (2.5 g) in THF (100 mL) was heated at reflux for 18 hours. The solvent was evaporated under reduced pressure. The residue was partitioned between ethyl acetate and saturated sodium bicarbonate solution and the organic layer was dried over sodium sulphate, filtered and the solvent evaporated under reduced pressure. The residue was purified by flash silica chromatography using 17% ethyl acetate in isohexane as solvent. Pure fractions were evaporated to dryness to afford the subtitled compound. Yield 1.7 g.

1. temperaturewas heated
2. temperatureat reflux for 18 hours
3. customThe solvent was evaporated under reduced pressure
4. customThe residue was partitioned between ethyl acetate and saturated sodium bicarbonate solution
5. dry with materialthe organic layer was dried over sodium sulphate
6. filtrationfiltered
7. customthe solvent evaporated under reduced pressure
8. customThe residue was purified by flash silica chromatography
9. customPure fractions were evaporated to dryness