[C:1]([CH2:4][C:5](=[O:7])[CH3:6])(=[O:3])[CH3:2].[CH:8]([O-])([O-])[O:9][CH2:10][CH3:11].C(OC(=O)C)(=O)C.CCO>CCOC(C)=O>[CH2:10]([O:9][CH:8]=[C:4]([C:5](=[O:7])[CH3:6])[C:1](=[O:3])[CH3:2])[CH3:11]A solution of Acetylacetone (40 mL), Ethyl orthoformate (95.4 mL) and Acetic anhydride (54.2 mL) was heated to reflux (150° C.) for 1 hour. The reaction solution was cooled to room temperature and was directly subjected to flash column chromatography (E. Merck Silica Gel (˜120 g); Eluent: 100% EtOAc followed by 5% EtOH in EtOAc). Concentration of the fractions containing the pure product using a rotavap at 40° C. afforded the title compound as a dark red viscous oil (10.4 g, 17.0%).
Wird geladen…
