C1-symmetric chiral bisphosphine, FcPh-Binap (1), which possesses a single diferrocenylphosphino moiety together with a conventional Ph2P-substituent, was prepared in enantiomericallypure forms. Ligand 1 is sterically less demanding than Fc-Segphos (A), which has two diferrocenylphosphino groups, and showed higher activity than A in the rhodium-catalyzed asymmetric conjugate addition of phenylboronic
Asymmetric Intermolecular Heck Reaction of Aryl Halides
作者:Chunlin Wu、Jianrong Zhou
DOI:10.1021/ja412277z
日期:2014.1.15
The asymmetric intermolecular Heckreaction has been limited to aryl and vinyl triflates. Herein, we extend the reaction to aryl and vinyl bromides. Various cyclic olefins coupled with high enantioselectivity. Only bisphosphine oxides on a spiro backbone formed highly stereoselective Pd catalysts. The use of alcoholic solvents and alkylammonium salts were essential to promote halide dissociation from
Palladium-catalyzed asymmetric Heck arylation of 2,3-dihydrofuran – effect of prolinate salts
作者:Adam Morel、Ewelina Silarska、Anna M. Trzeciak、Juliusz Pernak
DOI:10.1039/c2dt31672b
日期:——
Chiral ionic liquids (CILs) containing L-prolinate and L-lactate anions and non-chiral quaternary ammonium cations were employed in the palladium catalyzed enantioselective Heckarylation of 2,3-dihydrofuran with aryl iodides (iodobenzene, 4-iodotoluene, 2-iodoanisole, 4-iodoanisole, 4-iodoacetophenone). In all the reactions 2-aryl-2,3-dihydrofuran (3) was obtained as the main product with the yield
Enantioselective Intermolecular Heck and Reductive Heck Reactions of Aryl Triflates, Mesylates, and Tosylates Catalyzed by Nickel
作者:Xiaolei Huang、Shenghan Teng、Yonggui Robin Chi、Wenqiang Xu、Maoping Pu、Yun‐Dong Wu、Jianrong Steve Zhou
DOI:10.1002/anie.202011036
日期:2021.2.8
Nickel‐catalyzed intermolecular Heckreaction of cycloalkenes proceeds well with aryl triflates, mesylates and tosylates in excellent enantiomeric ratios. The asymmetric reductive Heckreaction also works with a 2‐cyclopentenone ketal, which is equivalent to conjugate arylation of the enone itself.
Rational design of cyclopropane-based chiral PHOX ligands for intermolecular asymmetric Heck reaction
作者:Marina Rubina、William M Sherrill、Alexey Yu Barkov、Michael Rubin
DOI:10.3762/bjoc.10.158
日期:——
rigid cyclopropyl backbone was synthesized and tested in the intermolecularasymmetricHeck reaction. Mechanistic modelling and crystallographic studies were used to predict the optimal ligand structure and helped to design a very efficient and highly selective catalytic system. Employment of the optimized ligands in the asymmetricarylation of cyclic olefins allowed for achieving high enantioselectivities