反应详情

温度

-5 °C

A solution of 1,4-dioxa-spiro[4.5]decane-8-carboxylic acid ethyl ester (1.0 g, obtained in example 133, step 1) in THF (8 mL) was added dropwise over a period of 10 minutes to a solution of lithiumdiisopropylamide (2M in THF/heptane/ethyl benzene, 4.67 mL) in THF (12 mL) kept at −5° C. (ice/methanol bath). Stirring was continued for 1 hour at 0° C. The reaction mixture was re-cooled to −5° C. and a solution of bromoacetonitrile (0.65 mL, [CAS Reg. No. 590-17-0]) in THF (4 mL) was added dropwise over a period of 10 minutes. Stirring was then continued for 16 hours at RT. The reaction mixture was poured into ice/water and was acidified with 1M aqueous HCl solution (50 mL). The aqueous layer was extracted two times with ethyl acetate and the combined organic layers were washed with brine, dried over Na2SO4 and filtered. The solvent was evaporated and the residue was purified by flash chromatography (silica gel, gradient of heptane in ethyl acetate) to give the title compound as a brown liquid (528 mg, 45%). MS (m/e): 254.2 [MH+].

1. customkept at −5° C.
2. stirringStirring
3. waitwas then continued for 16 hours at RT
4. extractionThe aqueous layer was extracted two times with ethyl acetate
5. washthe combined organic layers were washed with brine
6. dry with materialdried over Na2SO4
7. filtrationfiltered
8. customThe solvent was evaporated
9. customthe residue was purified by flash chromatography (silica gel, gradient of heptane in ethyl acetate)