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Volumn 65, Issue 6, 2000, Pages 1780-1787

Coupling reactions of alkynylsilanes mediated by a Cu(I) salt: Novel syntheses of conjugate diynes and disubstituted ethynes

Author keywords

[No Author keywords available]

Indexed keywords

1,3 BUTADIENE DERIVATIVE; ACETYLENE; ALKYNE; COPPER CHLORIDE; SILANE DERIVATIVE;

EID: 0034708636     PISSN: 00223263     EISSN: None     Source Type: Journal    
DOI: 10.1021/jo991686k     Document Type: Article
Times cited : (266)

References (107)
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    • The use of triethylamine or pyridine barely effected the reaction of 1a with a stoichiometric amount of CuCl to yield 3a in 9% and 1%, respectively. No trace of 3a was obtained in acetonitrile, THF, or toluene.
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    • note
    • The use of a polar solvent, DMF, is essential to promote the reaction. We consider that DMF would coordinate to an alkynylsilane to form the pentacoordinate but tetravalent species, which may behave as a pentavalent organosilicate that is formed by the addition of a fluoride ion to the organosilane and is known to be highly active to transmetalation.
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    • For instance, the appropriate choice of 1 and 8 furnished cross-coupling products 11, 11b, and 11d in 97, >99, and >99% yields, respectively, whereas the unfavored combination (1c with 8b, 1c with 8f, and 1e with 8f) decreased the yields (30, 19, and 27%, respectively).
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    • On the contrary, a triflate bearing an acetyl group at the orthoposition gave a trace amount of the cross-coupled product.
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    • dppf = 1,1′-bis(diphenylphosphino)ferrocene, dppe = 1,2-bis-(diphenylphosphino)ethane, dppp = 1,3-bis(diphenylphosphino)propane, and dppb = 1,4-bis(diphenylphosphino)butane.
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