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Iridium complex-catalyzed [2+2+2] cycloaddition of α,ω-diynes with monoalkynes: a new and efficient catalyst for cyclotrimerization of alkynes

✍ Scribed by Ryo Takeuchi; Shigeru Tanaka; Yoshihiko Nakaya

Publisher: Elsevier Science
Year: 2001
Tongue: French
Weight: 84 KB
Volume: 42
Category: Article
ISSN: 0040-4039
DOI: 10.1016/s0040-4039(01)00338-0

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✦ Synopsis

Ir(cod)Cl] 2 combined with dppe was found to be a new and efficient catalyst for [2+2+2] cycloaddition. Dimethyl dipropargylmalonate reacted with 1-hexyne in the presence of a catalytic amount of [Ir(cod)Cl] 2 combined with dppe at room temperature in 20 min to give an indane derivative in 84% yield. Various functionalized monoalkynes can be used for this [2+2+2] cycloaddition.

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