Sakashita K, Shibata Y, Tanaka K. Rhodium-Catalyzed Cross-Cyclotrimerization and Dimerization of Allenes with Alkynes.
Angew Chem Int Ed Engl 2016;
55:6753-7. [PMID:
27110668 DOI:
10.1002/anie.201602155]
[Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2016] [Indexed: 11/10/2022]
Abstract
It has been established that a cationic rhodium(I)/binap complex catalyzes the cross-cyclotrimerization of two molecules of a monosubstituted allene with one molecule of a functionalized alkyne to give 3,6-dialkylidenecyclohex-1-enes. In contrast, the reactions involving di- or trisubstituted allenes and/or unfunctionalized alkynes afforded cross-dimerization products, substituted dendralenes, through β-hydrogen elimination from the corresponding rhodacycles.
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