RESUMEN
New routes toward selective synthesis of both mono- and diaryl maleimides have been innovated. The mere requirement to this end is through the increase of temperature. The method works effectively for maleic anhydride and maleic acid as well. Also, the first expedient synthesis of 2-arylnaphthoquinones via the reaction of naphthoquinone with arenesulfonyl chlorides is revealed.
RESUMEN
A new paradigm in the coupling of external alkenes with internal electron-deficient alkenes has been investigated in which an unprecedented annulation of vinylarenes on maleimides takes place. The reaction is carried out via a tandem in situ activation of both olefinic and aromatic C-H bonds of styrenes driving the reaction in a pseudo-Diels-Alder mode.
RESUMEN
A successive metal-free TBHP-mediated regioselective C-H functionalization of coumarins toward expedient synthesis of 3-aroyl coumarins is unveiled. The ongoing method conducted through the reaction of either coumarins or coumarin-3-carboxylic acids with aromatic aldehydes. The optimized reaction condition also worked well with benzyl alcohols and styrenes as surrogates for aldehydes, which bear latent carbonyl functionality.
RESUMEN
An approach to synthesize 2,3-diaryl benzo[b]furans using coumarins and aryl bromides is developed. This state-of-the-art strategy capitalizes on a palladium-catalyzed one-pot decarbonylative diarylation of coumarins, paving the way to achieve biologically interesting 2,3-diaryl benzo[b]furans.