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Volumn 52, Issue 17, 2011, Pages 2165-2168

Cross-coupling reactions of alkenylsilanols with fluoroalkylsulfonates: Development and optimization of a mild and stereospecific coupling process

Author keywords

[No Author keywords available]

Indexed keywords

ALKANESULFONIC ACID; ALKENYL GROUP; BRONSTED BASE; FLUORINE; NUCLEOPHILE; PALLADIUM; TRIFLUOROMETHANESULFONIC ACID;

EID: 79953193707     PISSN: 00404039     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.tetlet.2010.11.133     Document Type: Article
Times cited : (12)

References (83)
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    • For the reviews on the synthesis of organo-triflates and nonaflates, see: (a)
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    • Heptenyldimethylsilanol (E)-1 was prepared according to known methods
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    • It has been reported that nonaflates are less susceptible than triflates to nucleophilic attack at the sulfur atom. We propose that this is the source of the undesired phenol formation.
    • It has been reported that nonaflates are less susceptible than triflates to nucleophilic attack at the sulfur atom. We propose that this is the source of the undesired phenol formation. Riggleman, S.; DeShong, P. J. Org. Chem. 2003, 68, 8106-8109.
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    • note
    • 12. It should also be noted that polar coordinating solvents such as THF, diglyme, dioxane, and dimethoxyethane (DME) facilitated cross-coupling: however, the best results were obtained using dioxane as the solvent.
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    • X-Phos was chosen as the ligand because it has been reported to prevent cyclometalation of palladium to the ligand especially in cationic palladium complexes. For recent reviews on dialkylbiaryl phosphine ligands see: (a)
    • X-Phos was chosen as the ligand because it has been reported to prevent cyclometalation of palladium to the ligand especially in cationic palladium complexes. For recent reviews on dialkylbiaryl phosphine ligands see: (a) Martin, R.; Buchwald, S. L. Acc. Chem. Res. 2008, 41, 1461-1473;
    • (2008) Acc. Chem. Res. , vol.41 , pp. 1461-1473
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    • note
    • Extensive optimization of all reaction variables was conducted ligands (NHC, bidentate, monodendate, etc.), palladium precatalysts, additives and solvents. It was found from these studies that Buchwald type dialkylbiaryl phosphine ligands were optimal in ethereal solvents (THF, dioxane, and DME); while all other combinations surveyed did not significantly improve the product yield. It should also be noted that the major side products observed in these reactions were disiloxane formation, from dimerization of (E)-1, and/or S-O bond cleavage.


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