Dehydrogenative coupling of cyclic enones with heteroarenes has been a longstanding challenge because of the competitive ketone dehydrogenation and conjugated addition. Herein, a dehydrogenative couplingreaction of cyclic enones of different sizes with substituted thiophenes to construct β-thienyl cyclic enone compounds through palladium-catalyzed C–H functionalization under mild reaction conditions is
Silver-catalyzed direct couplings of 2-substituted furans with cyclic 1,3-dicarbonyls
作者:Antonio Arcadi、Maria Alfonsi、Fabio Marinelli
DOI:10.1016/j.jorganchem.2007.08.011
日期:2007.11
Direct alkenylation of 2-substituted furans with cyclic 1;3-dicarbonyls by means of silver catalysis have been explored. Silver salts resulted more efficient than a variety of Lewis acids and p-TsOH. (c) 2007 Elsevier B.V. All rights reserved.
Palladium-Catalyzed Controllable Reductive/Oxidative Heck Coupling between Cyclic Enones and Thiophenes via C–H Activation
Herein, we report a straightforward, environmentally friendly, and controllable palladium/ligand catalytic system to enable reductive/oxidative Heckreactions of cyclic enones with thiophene or furan derivatives via C-H activation. The key to this tunable reaction is the appropriate intercepting thienyl-Pd(II)-enolate during the enolization process. Such a controllable and economic protocol would not
An easy route to 11-hydroxy-eudesmanolides. Synthesis of (±) decipienin A
作者:F. Javier Moreno-Dorado、Francisco M. Guerra、F. Javier Aladro、Jesús M. Bustamante、Zacarías D. Jorge、Guillermo M. Massanet
DOI:10.1016/s0040-4020(99)00328-2
日期:1999.5
The preparation of 11-hydroxy-eudesmanolides with the stereochemistry found in the Umbelliferae family of plants is described. The decalin system of the eudesmane skeleton is produced by the addition of 5-methyl-2-furyllithium to 3-ethoxycyclohex-2-enone and acidic treatment of the resulting adduct. The stereochemistry of the decalones obtained by this method has been corrected. The α-hydroxy-γ-lactone