Solvent-Free Broensted Acid-Catalyzed Michael Addition of Nitrogen-and Carbon-Containing Nucleophiles by Ultrasound Activation. -Conjugate addition of a variety of different nucleophiles to cyclic enones is achieved in the presence of TosOH as the catalyst under ultrasound irradiation. The ultrasound conditions are more efficient than running the reaction at high pressure. -(DU, X.-J.; WANG, Z.-P.; HOU, Y.-L.; ZHANG, C.; LI, Z.-M.; ZHAO*, W.-G.; Tetrahedron Lett. 55 (2014) 5, 1002-1005, http://dx.
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