Synthesis of Novel Methylene Bridge Functionalized Bis(indolyl)methanes through a Double Michael Addition
摘要:
A simple synthesis of a series of novel diethyl bis(indol-3-yl)methylmalonate is described. This involves domino Michael addition/elimination/Michael addition of indoles to diethyl ethoxymethylenemalonate as double Michael acceptor.
Synthesis of Novel Methylene Bridge Functionalized Bis(indolyl)methanes through a Double Michael Addition
摘要:
A simple synthesis of a series of novel diethyl bis(indol-3-yl)methylmalonate is described. This involves domino Michael addition/elimination/Michael addition of indoles to diethyl ethoxymethylenemalonate as double Michael acceptor.
Abstract Direct metal-free alkenylation of 2-methylindole via acid-mediated Michael addition–elimination reaction with ethoxymethylenemalononitrile or ethyl ethoxymethylenecyanoacetate affords 3-indolyl-2-cyanoacrylonitrile and ethyl 3-indolyl-2-cyanoacrylate. Behavior of 1H-indole is predictably different. GRAPHICAL ABSTRACT