Water-Compatible Synthesis of 2-Trifluoromethyl-1,3-Dioxanes
作者:Liliana Becerra-Figueroa、Alexander F. Tiniakos、Joëlle Prunet、Diego Gamba-Sánchez
DOI:10.1002/ejoc.201801367
日期:2018.12.31
A water-compatible method for the diastereoselective synthesis of 2-trifluormethyl-1,3-dioxanes is described. The reaction proceeds under mild reaction conditions using simple inorganic bases; it has a very good substrate scope and can be performed with different Michael acceptors. Additionally, the reaction products can be further functionalized, showing an excellent perspective for future applications
Indium(I) iodide was found to mediate in the Barbier allylation and in the Reformatsky reaction of aldehydes and ketones to give homoallylic alcohols and β-hydroxy esters, respectively, presumably via allylindium(III) diiodide.
Charge reversal of electrophilic π-allylpalladium intermediates; carbonyl allylation by allylic acetates with PdCl<sub>2</sub>(PhCN)<sub>2</sub>–SnCl<sub>2</sub>
Carbonylallylation by stable allylic acetates with Pd0–SnCl2 occurred regio-, chemo-, and diastereoselectively to afford the corresponding homoallylic alcohols.
Ti-Catalyzed Barbier-Type Allylations and Related Reactions
作者:Rosa E. Estévez、José Justicia、Btissam Bazdi、Noelia Fuentes、Miguel Paradas、Duane Choquesillo-Lazarte、Juan M. García-Ruiz、Rafael Robles、Andreas Gansäuer、Juan M. Cuerva、J. Enrique Oltra
DOI:10.1002/chem.200802180
日期:2009.3.9
Versatility of titanium: Titanocene(III) complexes catalyze Barbier‐type allylations, intramolecular crotylations (cyclizations), and prenylations of a wide range of aldehydes and ketones. These reactions take place at RT under mild conditions compatible with many functional groups; provide good yields of open‐chain and cyclic homoallylic alcohols, including heterocyclic derivatives; and can be conducted
Barbier allylation of aldehydes and ketones with aluminium and catalytic indium metal: an economical alternative
作者:Marcelo D. Preite、Hugo A. Jorquera-Geroldi、Andrés Pérez-Carvajal
DOI:10.3998/ark.5550190.0012.731
日期:——
An economical preparative protocol for the Barbierallylation of aldehydes and ketones in DMF, using aluminium foil in the presence of a catalytic amount of indiummetal, is reported. All yields obtained are in general similar but slightly lower than those reported for the stoichiometric indiumallylation. Aluminium alone failed to give rise to any detectable product.