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Stable 2-Azaallyl Salts as a Bridge between 2 H -Azirines and Densely Functionalized 2 H -Pyrroles.
Journal of Organic Chemistry 2024 April 18
An efficient protocol for the synthesis of stable 2-azaallyl anion salts by the reaction of alkyl 2-bromo-2 H -azirine-2-carboxylates with trimethylsilyl cyanide/Bu4 NF has been developed. The domino reaction proceeds in four steps via the cleavage of the azirine C-C bond to provide the tetrabutylammonium salts of stereochemically pure 2-azaallyl anions having U-configuration relative to the cyano groups. The anions with an ortho -substituted aryl group or styryl group exist as a mixture of two geometrical isomers across the N2-C3 bond. 2-Azaallyl anion salts have been shown to be convenient substrates for the one-pot synthesis of densely functionalized 2 H -pyrroles by the alkylation-cyclization sequence.
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