Gold (I)‐Catalyzed Asymmetric Cycloisomerization of Eneallenes into Vinylcyclohexenes.
ChemInform, 2007•Wiley Online Library
A new chiral gold (I)-catalyst is used for the cycloisomerization of eneallenes into
cyclohexenes tolerating various functional groups. Using other metal catalysts, five-and
seven-membered rings are produced. Moderate enantioselectivities are observed except for
sulfone (Vb) which is obtained in nearly racemic form. Reactions of methallyl-and phenallyl-
substituted substrates result in the formation of mixtures of regioisomers.
cyclohexenes tolerating various functional groups. Using other metal catalysts, five-and
seven-membered rings are produced. Moderate enantioselectivities are observed except for
sulfone (Vb) which is obtained in nearly racemic form. Reactions of methallyl-and phenallyl-
substituted substrates result in the formation of mixtures of regioisomers.
A new chiral gold (I)-catalyst is used for the cycloisomerization of eneallenes into cyclohexenes tolerating various functional groups. Using other metal catalysts, five-and seven-membered rings are produced. Moderate enantioselectivities are observed except for sulfone (Vb) which is obtained in nearly racemic form. Reactions of methallyl-and phenallyl-substituted substrates result in the formation of mixtures of regioisomers.
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