反应详情

温度

-78 °C

In a small RB flask THF (1.5 mL) was placed followed by diisopropylamine (80 μl, 0.57 mmol) and the mixture was cooled to −40° C. n-BuLi (1.6 M, 0.34 mL, 0.54 mmol) was added dropwise. It was stirred at this temperature for 20 min. The mixture was cooled to −78° C. and 3-[(1,4-dioxa-spiro[4.5]dec-8-yl)-(trans-4-methyl-cyclohexanecarbonyl)-amino]-thiophene-2-carboxylic acid methyl ester (200 mg, 0.47 mmol) in THF (2 mL) was added dropwise. Stirring at −78° C. was continued for 30 min. Tributyl borane (1M in ether, 0.48 mL) was added and the mixture was allowed to come to room temperature over a period of 1 h. This solution was added to a suspension of CuCN (47 mg) in THF (1 mL) cooled to −30° C. The mixture was stirred at this temperature for 20 min. 3-Bromocyclohexene (90%, 60 μl, 0.47 mmol) was added and the mixture was allowed to come to room temperature slowly. It was stirred at this temperature for 16 h. The mixture was cooled to 0° C. and 10% NaOH (0.8 mL) was added followed by dropwise addition of 30% H2O2 (0.27 mL). The mixture was stirred for 10 min. It was diluted with EtOAc, washed with water and brine, dried (MgSO4) and evaporated. Pure 5-cyclohex-2-enyl-3-[(1,4-dioxa-spiro[4.5]dec-8-yl)-(trans-4-methyl-cyclohexanecarbonyl)-amino]-thiophene-2-carboxylic acid methyl ester was obtained on chromatography over silica gel (hexane:EtOAc—9:1, 4:1 and 7:3 eluents) (153 mg, 64%).

1. additionwas added dropwise
2. stirringStirring at −78° C.
3. waitwas continued for 30 min
4. waitto come to room temperature over a period of 1 h
5. temperaturecooled to −30° C
6. stirringThe mixture was stirred at this temperature for 20 min
7. customto come to room temperature
8. stirringIt was stirred at this temperature for 16 h
9. temperatureThe mixture was cooled to 0° C.
10. stirringThe mixture was stirred for 10 min
11. washwashed with water and brine
12. dry with materialdried (MgSO4)
13. customevaporated