Rhodium-Catalyzed Branched and Enantioselective Direct α-Allylic Alkylation of Simple Ketones with Alkynes
作者:Liyu Xie、Haijian Yang、Mingliang Ma、Dong Xing
DOI:10.1021/acs.orglett.0c00375
日期:2020.3.6
first direct branched-selective α-allylic alkylation of simple ketones with alkynes under rhodium and secondary amine cooperative catalysis. Through a rhodium-hydride-catalyzed allylic substitution pathway, a series of valuable γ,δ-unsaturated ketones are obtained with excellent regioselectivity in an atom-economic and byproduct-free manner. With a chiral BIPHEP ligand, high enantioselectivity has been
Lewis acid/CpRu dual catalysis in the enantioselective decarboxylative allylation of ketone enolates
作者:David Linder、Martina Austeri、Jérôme Lacour
DOI:10.1039/b910475e
日期:——
The addition of a Lewisacidic metal triflate salt Mg(OTf)2 as co-catalyst in the CpRu-catalyzed decarboxylative allylation of in situ-generated ketone enolates allows the reaction to proceed at lower temperature with higher regio- and enantioselectivity. Even so-far-unreactive substrates react.
Iridium-Catalyzed Enantioselective Allylation of Aryl Enamides and Enecarbamates
作者:Bei-Bei Yue、Yi Deng、Yu Zheng、Kun Wei、Yu-Rong Yang
DOI:10.1021/acs.orglett.9b00764
日期:2019.4.5
Aromatic enamide and enecarbamate as a novel type of nucleophile in the asymmetric allylation of branched, racemic allylicalcohols to give homoallylic ketones has been described. Enabled by Carreira’s chiral Ir (P, olefin) complex, the reactions proceed in good yields with excellent enantioselectivities.
Regio- and Enantioselective Rhodium-Catalyzed Allylic Alkylation of Racemic Allylic Alcohols with 1,3-Diketones
作者:Sheng-Biao Tang、Xiao Zhang、Hang-Fei Tu、Shu-Li You
DOI:10.1021/jacs.8b05126
日期:2018.6.20
Highly regio- and enantioselective rhodium-catalyzed allylicalkylation of 1,3-diketones with racemic secondary allylic alcohols is reported. In the presence of a Rh-catalyst derived from the Carreira (P, olefin)-ligand and TFA as an additive, chiral branched α-allylated 1,3-diketones could be obtained in good to excellent yields, with excellent regio- and enantioselectivity ( b/ l > 19/1, 86-98% ee)
Planar-Chiral Cyclopentadienyl-Ruthenium-Catalyzed Regio- and Enantioselective Asymmetric Allylic Alkylation of Silyl Enolates under Unusually Mild Conditions
report the asymmetric allylic alkylation of allylic chlorides with silyl enolates as a carbon nucleophile using a planar‐chiral cyclopentadienyl‐ruthenium (Cp′Ru) catalyst. The reaction proceeds under unusually mild conditions to give the desired branched products with complete regioselectivity and high enantioselectivity, and reactive functional groups, such as aldehyde, can be tolerated. In this reaction