Phosphine-catalyzed regioselective heteroaromatization between activated alkynes and isocyanides leading to pyrroles

Add time:09/01/2019    Source:sciencedirect.com

The organophosphine catalyzed reaction of activated alkynes with isocyanides produces the corresponding heteroaromatization products, pyrroles, regioselectively in good yields. The reaction proceeds most probably through the 1,4-addition of the nucleophilic phosphine catalyst to the alkynes, followed by a [3+2] cycloaddition between the resulting alkenyl phosphine intermediates and a carbanion derived from the isocyanides.

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