Asymmetric Allylation of 2-Oxocycloalkanecarboxylates
作者:Masanori Yoshida、Shohei Yano、Shoji Hara
DOI:10.1055/s-0036-1588095
日期:——
this study, the highlyenantioselective α-allylation of α-substituted β-ketoesters, particularly 2-oxocycloalkanecarboxylates, is achieved by synergistic catalysis with an achiral palladium complex and a chiral primary amino acid. Various α-allylated β-ketoesters containing a quaternary carbon stereogenic center are synthesized in high yields (up to 97%) with excellent enantioselectivity (up to 99% ee)
Über die Stereospezifität der α-Alkylierung von β-Hydroxycarbonsäureestern. Vorläufige Mitteilung
作者:György Fráter
DOI:10.1002/hlca.19790620832
日期:1979.12.12
About the Stereospecific α-Alkylation of β-Hydroxyesters
关于β-羟基酯的立体特异性α-烷基化
Asymmetric α-Allylation of α-Substituted β-Ketoesters with Allyl Alcohols
作者:Masanori Yoshida
DOI:10.1021/acs.joc.7b02188
日期:2017.12.1
Enantioselective α-allylation of α-substituted β-ketoesters with simple allyl alcohols was successfully performed by synergistic catalysis with the catalyst combination of a chiral primary amino acid and an achiral palladium complex without additional promotors like acids or bases. The allylation reaction and generation of a chiral quaternary carbon stereocenter proceeded smoothly to produce α,α-disubstituted
π-Coordinating Chiral Primary Amine/Palladium Synergistic Catalysis for Asymmetric Allylic Alkylation
作者:Yaning Wang、Junli Chai、Chang You、Jie Zhang、Xueling Mi、Long Zhang、Sanzhong Luo
DOI:10.1021/jacs.9b13026
日期:2020.2.12
synergistic catalysis for asymmetric allylic alkylation of α-branched β-ketocarbonyls. The use of arene-containing chiral primary amine catalyst led to not only enhanced reaction rate but also reversed chiral induction comparing with its sterically bulky derivative. Both enantiomers of the allylic adducts bearing acyclic all-carbon quaternary stereocenters could be obtained from the same configured chiral aminocatalyst
The asymmetricalkylation of 2-methoxycarbonyl-1-indanone (2) and ethyl 2-methylacetoacetate (5) with an alkylsulfonium salt containing a sugar group were investigated. (S)-Ethyl 2-allyl-2-methylacetoacetate (6b) was obtained with up to 25% optical purity on alkylation of the enolate ion of 5 using the allyl(p-tolyl)sulfonio D-glucoside derivative (1h).