Combined InCl3- and Amine-Catalyzed Intramolecular Addition of alpha-Disubstituted Aldehydes onto Unactivated Alkynes

[摘要]：The combination of enamine-type catalysis to the indium-catalyzed activation of alkynes allows the efficient preparation of functionalized cyclopentanes bearing a quaternary stereogenic center. A broad range of formylalkynyl derivatives has been prepared. The InCl3/(Cy)(i-Pr)NH system efficiently promotes the carbocyclization reaction of alpha-disubstituted aldehydes in good to excellent yields.

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