PdII-Catalyzed Conjugate Addition of Boronic Acids to Ketoglutaconic Esters toward the Synthesis of Functionalized Pyridazin-3(2H)-ones with Neuroprotective Activity
作者:Silvia Roscales、Andrea Ortega、Sagrario Martín-Aragón、Paloma Bermejo-Bescós、Aurelio G. Csákÿ
DOI:10.1002/ejoc.201200734
日期:2012.9
The development of the regioselective conjugateaddition of boronicacids to ketoglutaconicesters under transition metal catalysis is reported. Among the different catalysts tested for this transformation, the dicationic PdII catalysts generated with Pd(OCOCF3)2, dppben, and HBF4 performed best in terms of yields, regioselectivities and avoidance of Heck-type by-products. The resulting 4-aryl-2-oxopentadienoates