Chalcones can unusually serve as the precursors of acetophenones which then undergo formal (4+1) cyclization with internal alkynes via rhodium(III) catalysis in a regio- and chemoselective manner. 1-Indanones containing quaternary carbon centers along with reusable aryl aldehydes were formed by this annulation. This discovery enables a practical two-step protocol to indanones from the reaction of acetophenones
Solution-phase parallel synthesis of substituted chalcones and their antiparasitary activity against Giardia lamblia
作者:Julio Montes-Avila、Sylvia P. Díaz-Camacho、Josefina Sicairos-Félix、Francisco Delgado-Vargas、I.A. Rivero
DOI:10.1016/j.bmc.2009.02.052
日期:2009.9
A library of 25-membered chalcones was prepared by parallel synthesis. Substituted acetophenones and benzaldehydes were condensed using the Claisen-Schmidt base-catalyzed aldol condensation. Several chalcones showed in vitro antiparasitic activity against Giardia lamblia. The highest activity observed for the IC50 values were 12.72, 15.05 and 15.31 mu g/mL, respectively; these are potential leads for the development of antigiardial compounds. (C) 2009 Elsevier Ltd. All rights reserved.