反应详情

温度

-30 °C

Sodium amide (0.40 g, 9.74 mmol) was weighed directly into a flame-dried 50 ml round-bottomed flask filled with argon. 11-Carbethoxyundecyltriphenylphosphonium bromide (5.00 g, 9.0 mmol) was added followed by anhydrous tetrahydrofuran (THF, 15 ml). The mixture was cooled to -30° C. After the reaction mixture had stirred for 30 minutes at -30° C., a solution of m-nitrobenzaldehyde (1.4 g, 9.30 mmol) in anhydrous THF (5 ml) was added dropwise. The reaction mixture was allowed to warm to room temperature and was stirred for 4 hours. Ether was added. The reaction mixture was cooled to 0° C., and H2O was cautiously added to destroy residual base. The ether layer was removed, washed with H2O, 2% NaHSO4 and brine, and dried (MgSO4). The solvent was evaporated under reduced pressure to yield an oily residue. Purification by column chromatography (150 g silica gel, hexanes:ethyl acetate, 15:1) gave the pure compound 4, ethyl-12-(m-nitrophenyl)-11-dodecenoate (1.323 g, 42% yield).

1. additionfilled with argon
2. temperatureto warm to room temperature
3. stirringwas stirred for 4 hours
4. temperatureThe reaction mixture was cooled to 0° C.
5. customto destroy residual base
6. customThe ether layer was removed
7. washwashed with H2O, 2% NaHSO4 and brine
8. dry with materialdried (MgSO4)
9. customThe solvent was evaporated under reduced pressure
10. customto yield an oily residue
11. customPurification by column chromatography (150 g silica gel, hexanes:ethyl acetate, 15:1)