Branch selective allylation of acetylacetone catalyzed by Water-soluble rhodium complex catalyst
摘要:
[RhCl(1,5-cod)](2)/PTA is highly active branch-selective catalyst for C-allylation of acetylacetone by allylic carbonates in water/ethyl acetate biphasic system, where either crotyl or 1-methylallyl carbonates gives sterically congested branched allylation product, suggesting formation of a common allylrhodium intermediate. (C) 2010 Elsevier B.V. All rights reserved.
Nickel-catalyzed efficient umpolung allylation of ketones with allyliccarbonates in the presence of zinc powder is developed, which accommodates a variety of allylic and ketone substrates. Although chiral ligand is necessary for the transformation, no enantioselectivity was observed. Nickel-catalyzed efficient umpolung allylation of ketones with allyliccarbonates in the presence of zinc powder is developed
Direct allylation of aromatic and α,β-unsaturated carboxamides under ruthenium catalysis
作者:Mirim Kim、Satyasheel Sharma、Neeraj Kumar Mishra、Sangil Han、Jihye Park、Minyoung Kim、Youngmi Shin、Jong Hwan Kwak、Sang Hoon Han、In Su Kim
DOI:10.1039/c4cc03354j
日期:——
The ruthenium-catalyzed oxidative allylation of aromatic and alpha,beta-unsaturated carboxamides with allylic carbonates is described. These transformations proceed readily with complete linear gamma-selectivity of substituted allylic carbonates.
Sequence‐Dependent Stereodivergent Allylic Alkylation/Fluorination of Acyclic Ketones
作者:Xi‐Jia Liu、Shicheng Jin、Wen‐Yun Zhang、Qiang‐Qiang Liu、Chao Zheng、Shu‐Li You
DOI:10.1002/anie.201912882
日期:2020.1.27
The stereodivergent iridium-catalyzed allylicalkylation and fluorination of acyclicketones is described. α-Pyridyl-α-fluoroketones with vicinal tertiary and quaternary stereocenters were obtained in moderate to excellent yields and stereoselectivities. Distinct from known stereodivergent synthesis, for which two different chiral catalysts are required in general, herein we report a sequence-dependent
Iridium-Catalyzed Allylic Substitutions with Cyclometalated Phosphoramidite Complexes Bearing a Dibenzocyclooctatetraene Ligand: Preparation of (π-Allyl)Ir Complexes and Computational and NMR Spectroscopic Studies
作者:Jevgenij A. Raskatov、Mascha Jäkel、Bernd F. Straub、Frank Rominger、Günter Helmchen
DOI:10.1002/chem.201201772
日期:2012.11.5
(π‐Allyl)Ircomplexes derived from dibenzocyclooctatetraene and phosphoramidites by cyclometalation are effective catalysts for allylicsubstitution reactions of linear monosubstituted allylic carbonates. These catalysts provide exceptionally high degrees of regioselectivity and allow the reactions to be run under aerobic conditions. A series of (π‐allyl)Ircomplexes were prepared and characterized
Ligand-enabled Ir-catalyzed intermolecular diastereoselective and enantioselective allylic alkylation of 3-substituted indoles
作者:Xiao Zhang、Wen-Bo Liu、Hang-Fei Tu、Shu-Li You
DOI:10.1039/c5sc01772f
日期:——
An Ir-catalyzed asymmetric allylic alkylation of 3-substituted indoles is reported. The reaction provides indoline products containing multiple contiguousstereocenters with high site-, regio-, diastereo- and enantioselectivities in onestep from a wide range of readily available starting materials. The key to this method is the high level of diastereocontrol enabled by an iridium catalyst derived
报道了 Ir 催化的 3-取代吲哚的不对称烯丙基烷基化。该反应从多种容易获得的起始原料中一步获得含有多个连续立体中心的二氢吲哚产物,具有高位点选择性、区域选择性、非对映选择性和对映选择性。该方法的关键是由源自N-芳基亚磷酰胺配体 (Me-THQphos, 1c ) 的铱催化剂实现的高水平非对映控制。