反应详情

To the oil isolated in Step B (23.28 g, 70.7 mmol) in THF (100 mL) at −78° C., LHDMS (1.0 M, 84.8 mL, 84.8 mmol) was added slowly. The reaction mixture was then stirred at room temperature for 1 hour. A solution of 2-nitro-5-phenoxybenzaldehyde (20.63 g, 75.5 mmol) in THF (100 mL) was added. The reaction mixture was stirred at room temperature overnight. Saturated aqueous ammonium chloride (200 mL) was added. The reaction mixture was extracted with ethyl acetate three times. The combined organic extracts were washed with brine and dried over magnesium sulfate. The reaction mixture was filtered and concentrated to yield a colorless oil which was a mixture of cis-[2-(2-nitro-5-phenoxy-benzylidene)-3-(tetrahydro-pyran-4-yl)-hept-6-enenitrile] and trans-[2-(2-nitro-5-phenoxy-benzylidene)-3-(tetrahydro-pyran-4-yl)-hept-6-enenitrile].

1. stirringThe reaction mixture was stirred at room temperature overnight
2. extractionThe reaction mixture was extracted with ethyl acetate three times
3. washThe combined organic extracts were washed with brine
4. dry with materialdried over magnesium sulfate
5. filtrationThe reaction mixture was filtered
6. concentrationconcentrated
7. customto yield a colorless oil which