Synthesis of carbobicyclic compounds via palladium-catalyzed cyclization/hydrosilylation: evidence for reversible silylpalladation.
Cyclization/hydrosilylation of substituted 1-vinyl-1-(3-butenyl)cycloalkanes catalyzed by a 1:1 mixture of (phen)Pd(Me)Cl (1) and NaBAr(4) [phen = 1,10-phenanthroline; Ar = 3,5-C(6)H(3)(CF(3))(2)] formed silylated spirocycles in high yield with excellent regio and diastereoselectivity. Cyclization/hydrosilylation of substituted 3-(3-butenyl)cycloalkenes or 2,3-diallyl-5,6-dimethyl-1,4-hydroquinone diacetate (16) formed silylated fused bicyclic complexes in good yield. Reaction of substituted 1,6,11-nonatrienes with silane catalyzed by 1/NaBAr(4) led to cascade cyclization with hydrosilylation. This latter procedure was employed in the synthesis of silylated bicyclopentanes and a linear triquinane.
P. M. Gross Chemical Laboratory, Duke University, Durham, NC 27708-0346, USA.
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X
Wang
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Chakrapani
C N
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Stengone
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Widenhoefer
D019086:Bridged Bicyclo Compounds, Heterocyclic / Q000138:chemical synthesis* / Q000737:chemistry; D002384:Catalysis; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D019158:N-Acetylneuraminic Acid / Q000737:chemistry*; D010165:Palladium / Q000737:chemistry*; D013055:Spectrophotometry, Infrared
D019086:Bridged Bicyclo Compounds, Heterocyclic; D010165:Palladium; D019158:N-Acetylneuraminic Acid