Catalytic Asymmetric γ-Alkylation of Carbonyl Compounds via Stereoconvergent Suzuki Cross-Couplings
摘要:
With the aid of a chiral nickel catalyst, enantioselective gamma- (and delta-) alkylations of carbonyl compounds can be achieved through the coupling of gamma-haloamides with alkylboranes. In addition to primary alkyl nucleophiles, for the first time for an asymmetric cross-coupling of an unactivated alkyl electrophile, an arylmetal, a boronate ester, and a secondary (cyclopropyl) alkylmetal compound are shown to couple with significant enantioselectivity. A mechanistic study indicates that cleavage of the carbon-halogen bond of the electrophile is irreversible under the conditions for asymmetric carbon-carbon bond formation.
Catalytic Asymmetric γ-Alkylation of Carbonyl Compounds via Stereoconvergent Suzuki Cross-Couplings
摘要:
With the aid of a chiral nickel catalyst, enantioselective gamma- (and delta-) alkylations of carbonyl compounds can be achieved through the coupling of gamma-haloamides with alkylboranes. In addition to primary alkyl nucleophiles, for the first time for an asymmetric cross-coupling of an unactivated alkyl electrophile, an arylmetal, a boronate ester, and a secondary (cyclopropyl) alkylmetal compound are shown to couple with significant enantioselectivity. A mechanistic study indicates that cleavage of the carbon-halogen bond of the electrophile is irreversible under the conditions for asymmetric carbon-carbon bond formation.
(±)-Oudenone, 2-(tetrahydro-5-propyl-2-furylidene)-1,3-cyclopentanedione, was conveniently synthesized by BF3-catalyzed acylation of 1,3-cyclopentanedione with 4-chloroheptanoic anhydride and subsequent cyclization with triethylamine in a 36% overall yield.
Smit; den Hertog, Recueil des Travaux Chimiques des Pays-Bas, 1958, vol. 77, p. 73,74,77
作者:Smit、den Hertog
DOI:——
日期:——
Proceedings of the Chemical Society. April 1959
作者:den Hertog、Smit
DOI:10.1039/ps9590000109
日期:——
Potter, Alan; Tedder, John M., Journal of the Chemical Society. Perkin transactions II, 1982, p. 1689 - 1692
作者:Potter, Alan、Tedder, John M.
DOI:——
日期:——
Catalytic Asymmetric γ-Alkylation of Carbonyl Compounds via Stereoconvergent Suzuki Cross-Couplings
作者:Susan L. Zultanski、Gregory C. Fu
DOI:10.1021/ja2079515
日期:2011.10.5
With the aid of a chiral nickel catalyst, enantioselective gamma- (and delta-) alkylations of carbonyl compounds can be achieved through the coupling of gamma-haloamides with alkylboranes. In addition to primary alkyl nucleophiles, for the first time for an asymmetric cross-coupling of an unactivated alkyl electrophile, an arylmetal, a boronate ester, and a secondary (cyclopropyl) alkylmetal compound are shown to couple with significant enantioselectivity. A mechanistic study indicates that cleavage of the carbon-halogen bond of the electrophile is irreversible under the conditions for asymmetric carbon-carbon bond formation.