Pd-Catalyzed Allylic Alkylation of CF3-Containing Esters with Three Electron-Withdrawing Groups
摘要:
Tsuji-Trost reaction (Pd-catalyzed allylic alkylation) of CF3-containing esters with three electron-withdrawing groups is reported. The reactions with methyl bis(trifluoromethyl) acetate and dimethyl ( trifluoromethyl) malonate were carried out with low-loading catalysts of Pd(0) and XPhos at ambient temperature in THF, giving the products in high yields. This method efficiently overcomes the beta-defluorination, which is hard to control in the chemical transformation of alpha-trifluoromethyl carbanions, and provides versatile fluorinated compounds with quaternary carbon centers, which are highly demanded in drug discovery.
The performance of tert-butanesulfinamides as nitrogen nucleophiles in Pd(0)-catalyzed allylic substitution reactions has been investigated. Metalated N-alkyl and N-acetyl sulfinamides have been identified as suitable partners for the reaction with π-allyl–palladium complexes. The cross-coupling of N-acetyl tert-butanesulfinamide with 2- or 3-substituted linear allylic carbonates is achieved in the
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.
<i>O</i>-Allylated Pudovik and Passerini Adducts as Versatile Scaffolds for Product Diversification
作者:Mansour Dolé Kerim、Tania Katsina、Martin Cattoen、Nicolas Fincias、Stellios Arseniyadis、Laurent El Kaïm
DOI:10.1021/acs.joc.0c01721
日期:2020.10.2
The palladium-catalyzed O-allylation of α-hydroxyphosphonates and α-hydroxyamides obtained from Pudovik and Passerini multicomponent reactions has allowed interesting and highly straightforward access to a variety of building blocks for product diversification. These post-functionalizations include a selective base- or ruthenium hydride-mediated isomerization/Claisen rearrangement cascade and a ring-closing
Fe-Catalyzed Multicomponent Reactions: The Regioselective Alkoxy Allylation of Activated Olefins and its Application in Sequential Fe Catalysis
作者:André P. Dieskau、Michael S. Holzwarth、Bernd Plietker
DOI:10.1002/chem.201103009
日期:2012.2.20
broadly applicable Fe‐catalyzed regioselectivealkoxyallylation of activated double bonds. Substituted allylic carbonates are converted into the corresponding σ‐enyl Fe complexes by reaction with Bu4N[Fe(CO)3(NO)] (TBAFe) at 30 °C. The liberated alkoxide adds to an activated double bond with the generation of a C‐nucleophile, which is trapped by the σ‐enyl Fe complex in a regioselective manner. Alternatively
我们在此介绍了一种多功能且广泛适用的活化双键的铁催化的区域选择性烷氧基烯丙基化反应。取代的烯丙基碳酸酯通过与Bu 4 N [Fe(CO)3(NO)](TBAFe)在30°C下反应转化为相应的σ-烯基Fe络合物。释放的醇盐会生成C-亲核试剂,从而形成一个活化的双键,该C-亲核试剂会以区域选择性的方式被σ-烯基Fe络合物捕获。或者,该醇盐在使经历迈克尔加成的外部前亲核试剂去质子化中用作碱。该方法的特点是宽泛的官能团耐受性,温和的反应条件,较低的催化剂载量和较高的区域选择性,有利于ipso取代产物。