Aldimines alkynylation

Wada, M., Sakurai, Y., Akiba, K.-y. (1984) Addition of Alkynyl Anions to Aldimines Containing A-Hydrogens A Novel Synthesis offi-Aminoacetylenes. Tetrahedron Letters, 25, 1083-1084. 

Scheme 9.17. Mannich reaction of alkynyl aldimines with a silylketeneacetal.

Furans and pyrroles. Of 2-alkynyl-l,3-dithiolanes, the consecutive reactions with cuprate reagents and aldehydes or aldimines lead to the five-membered heterocycles. 

Reactions of imines. Silyl alkynyl ethers and aldimines undergo catalyzed condensation, the strained heterocycles that ensue open to afford conjugated amides. YbfOTfjj is also a useful catalyst for the reaction of organocuprates with N-sulfonylimines. ... 

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