Pd-Catalyzed allylic alkylation of secondary nitroalkanes
作者:Keisuke Maki、Motomu Kanai、Masakatsu Shibasaki
DOI:10.1016/j.tet.2007.03.062
日期:2007.5
A Pd-catalyzed allylicalkylation of secondary nitroalkanes, using a catalytic amount of external base, was developed. Simple allyl carbonate and monosubstituted allyl carbonates were used as electrophiles, and bulky secondary nitroalkanes were used as nucleophiles. This is the first catalytic allylicalkylation of bulky secondary nitroalkanes, such as 2-nitroheptane. The use of the strong base DBU
Raising the p<i>K</i><sub>a</sub> Limit of “Soft” Nucleophiles in Palladium-Catalyzed Allylic Substitutions: Application of Diarylmethane Pronucleophiles
作者:Sheng-Chun Sha、Jiadi Zhang、Patrick J. Carroll、Patrick J. Walsh
DOI:10.1021/ja409511n
日期:2013.11.20
Tsuji-Trost allylicsubstitution reaction provides a useful and efficient approach to construct C-C bonds between sp(3)-hybridized carbons. The widely accepted paradigm for classifying the mode of attack of nucleophiles on palladium π-allyl intermediates in the Tsuji-Trost reaction is based on the pKa of the pronucleophile: (1) stabilized or "soft" carbonnucleophiles and heteroatom nucleophiles (e.g.,
Cu/Pd Synergistic Dual Catalysis: Asymmetric α‐Allylation of an α‐CF
<sub>3</sub>
Amide
作者:Akira Saito、Naoya Kumagai、Masakatsu Shibasaki
DOI:10.1002/anie.201702113
日期:2017.5.8
elusive. Herein, we report the strategic merger of CuI/base‐catalyzed enolization of an α‐CF3 amide and Pd0‐catalyzed allylic alkylation in an enantioselective manner to deliver chiral building blocks bearing a stereogenic carbon center connected to a CF3, an amide carbonyl, and a manipulable allylic group. The phosphine complexes of CuI and Pd0 engage in distinct catalytic roles without ligand scrambling
Palladium‐Catalyzed Asymmetric Allylic Alkylations with Toluene Derivatives as Pronucleophiles
作者:Jianyou Mao、Jiadi Zhang、Hui Jiang、Ana Bellomo、Mengnan Zhang、Zidong Gao、Spencer D. Dreher、Patrick J. Walsh
DOI:10.1002/anie.201509917
日期:2016.2.12
The first two highly enantioselective palladium‐catalyzed allylic alkylations with benzylic nucleophiles, activated with Cr(CO)3, have been developed. These methods enable the enantioselective synthesis of α‐2‐propenyl benzyl motifs, which are important scaffolds in natural products and pharmaceuticals. A variety of cyclic and acyclic allylic carbonates are competent electrophilic partners furnishing