Synthesis of Polysubstituted Bicyclo[3.3.1]nonane-3,7-diones from Cyclohexa-2,5-dienones and Dimethyl 1,3-Acetonedicarboxylate
作者:Pelayo Camps、Albert González、Diego Muñoz-Torrero、Montserrat Simon、Adriana Zúñiga、Miriam A. Martins、Mercè Font-Bardia、Xavier Solans
DOI:10.1016/s0040-4020(00)00680-3
日期:2000.10
Oxidation of polysubstituted phenols with phenyliodonium diacetate gives cyclohexa-2,5-dienones, which on reaction with dimethyl 1,3-acetonedicarboxylate afford double-Michael-addition derivatives, whose hydrolysis and decarboxylation provides polysubstituted bicyclo[3.3.1]nonane-3,7-diones. For steric and/or electronic reasons, the Michael reaction only works with 3,5-unsubstituted or 3-substituted
Iodobenzene and m-chloroperbenzoic acid mediated oxidative dearomatization of phenols
作者:Neha Taneja、Rama Krishna Peddinti
DOI:10.1016/j.tetlet.2016.07.078
日期:2016.8
iodobenzene, and m-CPBA as a co-oxidant has been achieved via in situ generation of PhIO2, a hypervalent iodine(V) species. The transiently generated orthobenzoquinone monoketals further underwent Diels–Alderreaction with various dienophiles to furnish densely substituted bicyclo[2.2.2]octenones in high selectivities and yields. This methodology features ready availability of reagents, cost effectiveness, safety
Nuclear vs. side-chain reactivity in the anodic oxidation of 2-(4-alkylphenoxy)ethanol derivatives. An interesting effect of the 2-hydroxyethyl group
作者:Michael P. Capparelli、Richard S. DeSchepper、John S. Swenton
DOI:10.1039/c39870000610
日期:——
Anodicoxidation of 2-(4-alkylphenoxy)ethanolderivatives in methanol using potassium fluoride as electrolyte at constant current affords good yields of 4-alkyl-4-methoxycyclohexa-2,5-dienone acetals.
Copper‐Catalyzed Olefination of 4‐CF
<sub>3</sub>
‐Substituted Cyclohexadienones Using Sulfonylmethyl Isocyanides: An Electrostatic Repulsion‐Controlled Regioselectivity Switch Strategy
作者:Seungwon Lee、Mohamed Ahmed Abozeid、Hun Young Kim、Kyungsoo Oh
DOI:10.1002/adsc.202201333
日期:2023.2.21
was shown to exert a pronounced electrostatic repulsion effect to give the olefination products via a preferential [3+2] cycloaddition with the ketone moiety followed by a facile fragmentation of transient oxazoline intermediates. The current Cu(II)-catalyzed olefination of 4-CF3-substituted cyclohexadienones demonstrates the reaction dichotomy involving a CF3-controlled 1,2-addition over a Van Leusen