Michael addition reaction of arylboronic acids to cyclohexa-2,4-dienones followed by aromatization sequence in one-pot furnished several oxygenatedbiphenyl derivatives. Application of the developed methodology was successfully applied to the synthesis of biphenyl natural products aucuparin and 2′-hydroxy-3,4,5-trimethoxybiphenyl.
Cyclohexa-2,4-dien-1-one derivatives, upon reaction with N-heterocycles in the presence of scandium(III) triflate, underwent a tandem Michael addition reaction followed by aromatization of the Michael adduct generated in situ to give N-aryl heterocycles in good yields. Because of the ready accessibility of variously substituted cyclohexa-2,4-dien-1-ones, a range of N-aryl heterocycles have become
A facile process for the synthesis of highly substituted bicyclo[4.1.0]heptenones via Corey–Chaykovsky reaction of quinonemonoketals is presented. The obtained products were employed to functionalize 3-position of indoles providing compounds which might have potential use in medicinal chemistry.
o-benzoquinones, on reaction with nitrileoxides generated in situ from the corresponding hydroxamoyl chlorides, provide [3+2] cycloaddition products or novel isoxazoline derivatives through an unprecedented rearrangement. The isolated [3+2] cycloadducts could be transformed into the corresponding isoxazoline derivatives in the presence of Et3N and highlyfunctionalized benzisoxazoles in the presence
Several masked o-benzoquinone (MOBs) derivatives successfully took part in the Baylis–Hillman reaction with various aldehydes and ketones to furnish the corresponding condensation products in this study.