Decarboxylative Claisen Condensations with Substituted Malonic Acid Half Oxyesters
作者:Marc Presset、Tania Xavier、Parvine Tran、Apolline Gautreau、Erwan Le Gall
DOI:10.1055/a-1950-5110
日期:2023.2
A decarboxylative Claisen condensation involving substituted malonicacid half oxyesters (SMAHOs) as pronucleophiles has been developed. The addition of their magnesium enolates to various acyl donors allows the synthesis of functionalized α-substituted β-keto esters in moderate to excellent yields (13–96%). In addition to acyl chlorides and acid anhydrides, these conditions proved efficient for the
作者:Alex L. Bagdasarian、Stasik Popov、Benjamin Wigman、Wenjing Wei、Woojin Lee、Hosea M. Nelson
DOI:10.1021/acs.orglett.0c01745
日期:2020.10.16
l urea-catalyzed functionalization of unactivated C–H bonds. In this system, the urea catalystmediates the formation of high-energy vinyl carbocations that undergo facile C–H insertion and Friedel–Crafts reactions. We introduce a new paradigm for these privileged scaffolds where the combination of hydrogen-bonding motifs and strong bases affords highly active Lewisacidcatalysts capable of ionizing