反应详情

A solution of tert-butyl 4-((2-bromo-2,2-difluoroacetamido)methyl)-4-hydroxypiperidine-1-carboxylate (example 37, step a) (3.2 g) in THF (40 mL) was added dropwise over 15 minutes to a stirred solution of potassium tert-butoxide (1M in t-butanol, 16.53 mL) and THF (60 mL) at 70° C. under nitrogen. At the end of the addition the mixture was heated for a further 10 minutes and then cooled to room temperature. The mixture was partitioned between ethyl acetate and brine, the organic layer was dried over sodium sulphate, filtered and the solvent evaporated under reduced pressure. The crude product was purified by flash silica chromatography using 30% isohexane in ethyl acetate. Pure fractions were evaporated to dryness to afford the subtitled compound. Yield 0.55 g.

1. additionAt the end of the addition the mixture
2. temperaturewas heated for a further 10 minutes
3. customThe mixture was partitioned between ethyl acetate and brine
4. dry with materialthe organic layer was dried over sodium sulphate
5. filtrationfiltered
6. customthe solvent evaporated under reduced pressure
7. customThe crude product was purified by flash silica chromatography
8. customPure fractions were evaporated to dryness