反应详情

t-BuOK (5.5 g, 58 mmol, 2 eq) was added portion-wise to a stirred suspension of Ph3P+CH2OmeCl− (21.7 g, 63 mmol, 2.2 eq) in THF (100 mL) under N2 in an ice-bath. After stirring the red solution at RT for 30 min, 2-formyl-6-nitro-benzoic acid methyl ester (Example 1, Step C, 5.1 g, 29 mmol, 1 eq) in THF (15 mL) was added. The reaction was stirred at RT for 1 h, quenched with saturated NH4Cl and extracted with EtOAc. The organic layer was washed with H2O (2×), dried (MgSO4) and concentrated in vacuo to give a dark oil. Purification by silica flash chromatography (0-20% EtOAc:hexane) gave the desired compound as a yellow oil (a mixture of ca. 1.7:1 E/Z isomers).

1. stirringThe reaction was stirred at RT for 1 h
2. customquenched with saturated NH4Cl
3. extractionextracted with EtOAc
4. washThe organic layer was washed with H2O (2×)
5. dry with materialdried (MgSO4)
6. concentrationconcentrated in vacuo
7. customto give a dark oil
8. customPurification by silica flash chromatography (0-20% EtOAc:hexane)