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The presented selective title reaction affords a broad scope of indenes and benzylidenehydrazones in good to high yields.

A mild and general alkylation of terminal alkynes with transient σ-alkylpalladium(II) complexes for assembling alkyl-substituted alkynes is described. This method represents a new way to the use of transient σ-alkylpalladium(II) complexes in organic synthesis through 1,2-carboalkynylation of alkenes.

Various different functionalized alkynes can be methylated through a C(sp)—C(sp3) bond formation process.

The title reaction provides a new and mild approach to a number of indole products of type (III), (V), and (VII).

A novel, mild, and selective method for the synthesis of the compounds (III), (V), (VI), (VIII), and (IX) is reported.

Ruthenium-catalyzed intramolecular cyclization of an alkyne onto an α-amido C(sp3) carbon atom proceeds smoothly under base-free conditions to give quinolinones (II) and (IV) in moderate yields.

The substitution pattern at the indan products depends on the phosphine ligand in conditions A) or B).

Palladium-catalyzed cocyclotrimerization of allenes with arynes has been developed for selectively synthesizing phenanthrenes. In the presence of [(allyl)PdCl] 2 and P(o-tol) 3 , a variety of allenes, including internal and terminal allenes, underwent the cocyclotrimerization with arynes to afford the corresponding phenanthrenes in moderate to good yields. The results showed the selectivity of the reaction based on allenes.

A novel and general halopalladation/decarboxylation/carbon−carbon forming domino protocol is described for the synthesis of 5-halo-6-substituted benzo[b]naphtho[2,1-d]furans. The protocol represents the first example of trapping the σ-vinylpalladium intermediate, generated from halopalladation of alkynes, by the decarboxylative coupling reaction.

A mild and general cycloaddition of arynes with iodonium ylides protocol has been developed for the synthesis of benzofurans. In the presence of CsF, ortho-silyl aryltriflates were reacted with iodonium ylides smoothly at room temperature in moderate to good yields.