Conjugate Addition Reactions of <i>N</i>-Carbamoyl-4-pyridones and 2,3-Dihydropyridones with Grignard Reagents in the Absence of Cu(I) Salts
作者:Fenghai Guo、Ramesh C. Dhakal、R. Karl Dieter
DOI:10.1021/jo400936z
日期:2013.9.6
4-addition reactions with Grignardreagents in the presence of chlorotrimethylsilane (TMSCl) or BF3·Et2O in excellent yields. Copper catalysis is not required, and mechanistic considerations suggest that the reaction is proceeding by a conjugate addition pathway rather than by a pathway involving 1,2-addition to an intermediate pyridinium ion. TMSCl-mediated conjugate addition of Grignardreagents to 2-substituted-2
Transannular and intermolecular interactions between chalcogen atoms: syntheses and properties of dichalcogena dications and trichalcogena hypervalent dications
作者:Naomichi Furukawa、Kenji Kobayashi、Soichi Sato
DOI:10.1016/s0022-328x(00)00326-0
日期:2000.10
Intramolecular (transannular) and intermolecular through-space interactions between chalcogen atoms have been described. This account includes the following three topics. (1) Various types of bis-chalcogenides and their mono-oxides, which have the two chalcogen atoms in close proximity in a molecule, give the dichalcogena dications upon the oxidation with two equivalents of NOBF4 or treatment with one equivalent
Synthesis of the tetracyclic core of <i>Illicium</i> sesquiterpenes using an organocatalyzed asymmetric Robinson annulation
作者:Lynnie Trzoss、Jing Xu、Michelle H Lacoske、Emmanuel A Theodorakis
DOI:10.3762/bjoc.9.126
日期:——
An enantioselective synthesis of the core framework of neurotrophic Illicium majucin-type sesquiterpenes is described here. This strategy is based on an organocatalyzedasymmetric Robinson annulation and provides an efficient approach for a diversity-oriented synthesis of Illicium naturalproducts that holds remarkable therapeutic potential for neurodegenerative diseases.
[EN] C4-MONOMETHYL TRITERPENOID DERIVATIVES AND METHODS OF USE THEREOF<br/>[FR] DÉRIVÉS MONOMÉTHYLE TRITERPÉNOÏDES EN C4 ET LEURS PROCÉDÉS D'UTILISATION