Catalytic Direct Nucleophilic Substitution of Primary Morita–Baylis–Hillman Adducts and Application to the Straightforward Synthesis of Dihydroisoindolones
iron/boron-catalyzed direct nucleophilicsubstitution of functionalized primary allylic alcohols with a large variety of nucleophiles. The resulting substitution products are useful synthetic platforms for heterocycle synthesis, as illustrated in a ready access to tetrahydroisoindol-4-ones. An interesting γ-carbonyl effect permits the dual iron/boron-catalyzed direct nucleophilicsubstitution of functionalized
The first DMAP-mediated palladium-free Tsuji–Trost-type reaction of cyclic and acyclic Baylis–Hillman alcohols with active methylene compounds
作者:Olfa Mhasni、Farhat Rezgui
DOI:10.1016/j.tetlet.2009.11.053
日期:2010.1
Direct allylic substitution of cyclic Baylis–Hillman alcohols with active methylene compounds under modified Taber’s conditions (DMAP, toluene, reflux, 4 Å molecular sieves), with no Pd catalysts/activating agents, as is usually required for the process, affords the C-allylation products in moderate to good yields.
Et<sub>3</sub>B-mediated and palladium-catalyzed direct allylation of β-dicarbonyl compounds with Morita–Baylis–Hillman alcohols
作者:Ahlem Abidi、Yosra Oueslati、Farhat Rezgui
DOI:10.3762/bjoc.12.234
日期:——
A practical and efficient palladium-catalyzed direct allylation of beta-dicarbonylcompounds with both cyclic and acyclic Morita-Baylis-Hillman (MBH) alcohols, using Et3B as a Lewis acid promoter, is described herein. A wide range of the corresponding functionalized allylated derivatives have been obtained in good yields and with high selectivity.
An Efficient One Pot Synthesis of Bicyclic Dienones
作者:Farhat Rezgui、Mohamed Moncef El Gaïed
DOI:10.1039/a902012h
日期:——
Bicyclic dienones 4 are prepared in a one pot process from the reaction of 2-(acetoxymethyl)cyclohex-2-enone 1 with 1,3-dicarbonyl compounds 2 in the presence of K2CO3 in refluxing absolute ethanol.
Annelation of Baylis–Hillman Derivatives: Synthesis of Highly Functionalised Tetrahydronaphthalenes
作者:Asma J'mour、Farhat Rezgui
DOI:10.3184/030823409x12532103537360
日期:2009.10
PTSA-promoted Robinson annelation of α-(3-oxobutyl)cyclohex-2-en-1-one derivatives in refluxing toluene, affords efficiently in a one pot process a variety of hydroxytetrahydronaphthyl carbonyl compounds in good yields. Further highly regioselective electrophilic bromination of these intermediates gave the corresponding bromide derivatives in 92–97% yield.