反应详情

A mixture of the 3-ethyl-4-hydroxy-benzaldehyde (7.8 g, 51.9 mmol) obtained in Example 179.1, K2CO3 (10.8 g, 78 mmol) and isopropyl iodide (7.86 ml, 78 mmol) was heated in DMF (65 ml) for 3 h. to 80° C. and subsequently stirred for 12 h. at room temperature. The mixture was poured into ice-cold 0.5M HCl and extracted with diethyl ether. The organic phase was washed with NaCl solution, dried, filtered and concentrated. The residue was purified by chromatography (SiO2, hexane/EtOAc 4:1). 3-Ethyl-4-isopropoxy-benzaldehyde was obtained as an orange oil (6.12 g, 61%); MS: 192 ([M]+).

1. extractionextracted with diethyl ether
2. washThe organic phase was washed with NaCl solution
3. customdried
4. filtrationfiltered
5. concentrationconcentrated
6. customThe residue was purified by chromatography (SiO2, hexane/EtOAc 4:1)