Abstract
An efficient synthesis of N-sulfonyl-sub- stituted 2-imino-3,4-dihydrocoumarins and 2-imino- coumarins via a copper-catalyzed multicomponent reaction of sulfonyl azides with terminal alkynes and b-(ortho-hydroxyphenyl)-a,b-unsaturated ke- tones or ortho-hydroxyphenylpropiolates has been developed. The cascade process involves trapping the keteimine by a nucleophilic addition and an in- tramolecular Michael addition. This methodology could well be extended to the concise synthesis of the polysubstituted piperidine scaffold.
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