New DBU (1,8-Diazabicyclo[5.4.0]undec-7-ene) Assisted One-Pot Synthesis of 2,8-Disubstituted 4H-1-Benzopyran-4-ones

All articles of this category 2-Hydroxy-3-(alkoxycarbonyl or prop-1-enyl)phenyl alkyl ketones are easily converted into 2,8-disubstituted (3-methyl)-4 H -1-benzopyran-4-ones through a new DBU (1,8-diazabicyclo[5.4.0]undec-7-ene) assisted one-pot synthesis, by reaction with aroyl or alkanoyl chlorides or anhydrides. The method is simple, mild and convenient as compared to the existing multistep procedures. 1,8-diazabicyclo[5.4.0]undec-7-ene - 4-oxo-4 H -1-benzopyran-8-carboxylates - one-pot synthesis - 2,8-distubstituted-4 H -1-benzopyran-4-ones - 2-hydroxy-3-(1-oxoalkyl)-benzoates