作者:Mohammed Ahrach、Philippe Gérardin、Bernard Loubinoux
DOI:10.1080/00397919708006788
日期:1997.6
Treatment of 2-hydroxybenzaldehydes by potassium t-butoxide in THF at 0 degrees C, followed by addition of beta-nitroenones 1 affords 2-acyl-2-alkyl-4-hydroxy-3-nitrochromanes 3. Subsequent treatment of these nitro alcohols by silica gel at 50 degrees C leads to the desired 2-acyl-2-alkyl-3-nitro-2H-chromenes 4 in good yields.