反应详情

2-Fluoro-3-(2-hydroxyethyl)benzaldehyde (example 48, step a) (1.05 g) was added to a solution of 2,2,2-trifluoro-1-(1-oxa-4,9-diazaspiro[5.5]undecan-4-yl)ethanone trifluoroacetate (example 12, step d) (2.08 g) and acetic acid (0.33 mL) in N-methyl-2-pyrrolidinone (10 mL). The resulting mixture was stirred for 15 min then cooled in an ice bath. Sodium triacetoxyborohydride (1.81 g) was then added and the mixture stirred overnight. The reaction was poured into a mixture of saturated sodium hydrogen carbonate solution (20 mL) and water (100 mL). The aqueous was extracted with ethyl acetate (3×100 mL). The combined organics were washed with water (50 mL) and brine (100 mL), dried over sodium sulphate, filtered and evaporated. The residue was purified by silica gel chromatography eluting with 4:1 isohexane:ethyl acetate+5% triethylamine to ethyl acetate+5% triethylamine gradient. The fractions containing product were combined and evaporated to give the subtitled compound as a clear oil. Yield 1.9 g. Used immediately.

1. temperaturethen cooled in an ice bath
2. stirringthe mixture stirred overnight
3. extractionThe aqueous was extracted with ethyl acetate (3×100 mL)
4. washThe combined organics were washed with water (50 mL) and brine (100 mL)
5. dry with materialdried over sodium sulphate
6. filtrationfiltered
7. customevaporated
8. customThe residue was purified by silica gel chromatography
9. washeluting with 4:1 isohexane
10. additionThe fractions containing product
11. customevaporated