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The phosphine‐catalyzed Michael addition/intramolecular Wittig reaction between dialkyl acetylenedicarboxylate and amino‐carbaldehyde or amino ester derivatives has been developped. This reaction can be rendered catalytic in phosphine by the in situ chemoselective reduction of the phosphine oxide with silane. This methodology enables rapid access to a variety of nitrogen‐containing heterocycles, which...
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