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A regio‐, diastereo‐, and enantioselective [4+3] cycloaddition between vinylcarbenes and dienes has been achieved using the dirhodium tetracarboxylate catalyst [Rh2(S‐BTPCP)4]. This methodology provides facile access to 1,4‐cycloheptadienes that are regioisomers of those formed from the tandem cyclopropanation/Cope rearrangement reaction of vinylcarbenes with dienes.
Nichts bleibt dem Zufall überlassen: Ein einfaches Protokoll für die selektive Kreuzkupplung von Diazoverbindungen zur Synthese von Alkenen wurde entwickelt (siehe Schema; EDG=Aryl, Heteroaryl, Vinyl; R=O‐Alkyl, Aryl). Mithilfe von DFT‐Rechnungen und der ReaktIR‐Methode wurden die entscheidenden Faktoren für den Reaktionsverlauf ermittelt, die zum gezielten Entwurf von Diazo‐Kupplungsreaktionen dienen...
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