Cyclization/Hydrosilylation of Functionalized Diynes Catalyzed by a Cationic Rhodium Bis(phosphine) Complex
Organometallics2002Vol. 21(25), pp. 5666–5673
Citations Over TimeTop 14% of 2002 papers
Abstract
The cationic rhodium complex [Rh(BINAP)(COD)]+ BF4- (2) [BINAP = (±)-2,2‘-bis(diphenylphosphino)binaphthyl] catalyzed the cyclization/hydrosilylation of 5,5-dicarbomethoxy-2,7-nonadiyne (1) and triethylsilane to form (E,Z)-1,1-dicarbomethoxy-3-ethylidene-4-(1-triethylsilylethylidene)cyclopentane (3) in 77% yield with ≥50:1 isomeric purity. A number of functionalized 1,6-diynes that possessed internal alkynes in addition to 1 underwent cyclization/hydrosilylation catalyzed by 2 to form silylated 1,2-dialkylidenecycloalkanes in moderate to good yield with high diastereoselectivity.
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