反应详情

A solution of piperidine (204 mg) and (4-formylphenyl)acetic acid methyl ester (Example 16, step a, 356 mg) in dichloromethane (10 mL) was stirred for 1 hour, treated with sodium triacetoxyborohydride (636 mg) and stirred overnight. The resultant mixture was loaded onto a conditioned SCX cartridge (10 g, Varian) and washed with methanol (50 mL), then eluted with methanolic ammonia solution (50 mL). The elution fraction was evaporated and the residue was dissolved in ethanol (20 mL), treated with anhydrous calcium chloride (444 mg), followed by sodium borohydride (303 mg) and stirred overnight. The mixture was quenched with aqueous potassium carbonate solution (2M, 20 mL) and concentrated to remove most of the ethanol. The residue was extracted with ethyl acetate and the washed and dried (sodium sulfate) extract was evaporated. The residue was purified on silica, eluting with 5% triethylamine in diethyl ether to give the subtitle product, as a colourless oil (287 mg).

1. washwashed with methanol (50 mL)
2. washeluted with methanolic ammonia solution (50 mL)
3. customThe elution fraction was evaporated
4. dissolutionthe residue was dissolved in ethanol (20 mL)
5. additiontreated with anhydrous calcium chloride (444 mg)
6. stirringstirred overnight
7. customThe mixture was quenched with aqueous potassium carbonate solution (2M, 20 mL)
8. concentrationconcentrated
9. customto remove most of the ethanol
10. extractionThe residue was extracted with ethyl acetate
11. washthe washed
12. dry with materialdried (sodium sulfate)
13. extractionextract
14. customwas evaporated
15. customThe residue was purified on silica
16. washeluting with 5% triethylamine in diethyl ether