Réaction régiospécifique des carbanions stabilisés avec la 2-(acétoxyméthyl)cyclohex-2-én-1-one: Synthèse de diénones bicycliques
摘要:
Regiospecific replacement of acetoxy group in 2-(acetoxymethyl)-2-cyclohexenone 1 by stabilized carbanions, leads to S-N 2 type products 2a-g, 5 and 6. Bicyclic dienones 4 are prepared in ''one pot'' from the reaction of 2 with K2CO3 in refluxing absolute ethanol. (C) 1997 Elsevier Science Ltd.
Formation of Quaternary Stereogenic Centers by NHC-Cu-Catalyzed Asymmetric Conjugate Addition Reactions with Grignard Reagents on Polyconjugated Cyclic Enones
The copper‐catalyzedconjugateaddition of various Grignard reagents to polyconjugated enones (dienone and enynone derivatives) is reported. The catalyst system, composed of copper triflate and an NHC ligand, led to the unusual selective formation of the 1,4‐addition products. This reaction allows for the creation of all‐carbon chiral quaternary centers with enantiomeric excesses up to 99 %. The remaining
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.