A Palladium-Catalyzed Cascade C–C Activation of Cyclopropenone and Carbonylative Amination: Easy Access to Highly Functionalized Maleimide Derivatives
作者:Tanmayee Nanda、P. C. Ravikumar
DOI:10.1021/acs.orglett.9b04656
日期:2020.2.21
We describe herein the first report on palladium-catalyzed C-C bond activation of cyclopropenone and concomitant carbonylative amination to produce maleimides. The interesting aspect of this reaction is that the sacrificial elimination of carbon monoxide from the substrate is efficiently recaptured by one of the intermediates in the catalytic cycle for the formation of maleimides. 18O isotopic studies
Reaction of Diphenylcyclopropenone with Nitroketeneaminals. Synthesis of 6-Amino-2-pyridones and Their m-Chloroperbenzoic Acid Oxidation to 2,3-Diphenylmaleimides
Reaction of diphenylcyclopropenone with nitroketeneaminals gave 6-amino-2-pyridones, which were oxidized by m-chloroperbenzoicacid to 2,3-diphenylmaleimides.
Phosphine-catalyzed activation of cyclopropenones: a versatile C<sub>3</sub> synthon for (3+2) annulations with unsaturated electrophiles
作者:Xin He、Pengchen Ma、Yuhai Tang、Jing Li、Shenyu Shen、Martin J. Lear、K. N. Houk、Silong Xu
DOI:10.1039/d2sc04092a
日期:——
α-ketenyl phosphorous ylide is validated as the key intermediate, which undergoes preferential catalytic cyclization with aldehydes rather than stoichiometric Wittig olefinations. This phosphine-catalyzed activation of cyclopropenones thus supplies a versatile C3 synthon for formal cycloadditon reactions.