Concise Synthesis of <font>α</font>-(Hydroxymethyl) Alkyl and Aryl Vinyl Ketones
作者:Jihène Ben Kraïem、Hassen Amri
DOI:10.1080/00397911.2011.592626
日期:2013.1.1
first been reported as starting materials for the synthesis of a new class of α-hydroxymethyl-α,β-unsaturated ketones 3. Thus, under heterogeneous liquid–liquid medium in the presence of concentrated aqueous potassium carbonate as a base, both aliphatic and aromatic 2,4-dioxoalkanoates 2 react with aqueous formaldehyde to afford the corresponding ketones 3 in fair to good yields. GRAPHICAL ABSTRACT
The Aldol Reaction under High-Intensity Ultrasound: A Novel Approach to an Old Reaction
作者:Giancarlo Cravotto、Alberto Demetri、Gian Mario Nano、Giovanni Palmisano、Andrea Penoni、Silvia Tagliapietra
DOI:10.1002/ejoc.200300369
日期:2003.11
We have employed high-intensityultrasound (HIU) to reinvestigate the aldolreaction (AR) in water. A number of aldols that under usual conditions would undergo elimination were isolated in acceptable to good yields. Within 15−30 min, acetophenone reacted with non-enolizable aldehydes to afford the aldol exclusively, while under conventional conditions (stirring or heating under reflux) the same compounds