Effect of additives on the proline-catalyzed ketone–aldehyde aldol reactions
作者:Petri M. Pihko、Katri M. Laurikainen、Annina Usano、Annika I. Nyberg、Jatta A. Kaavi
DOI:10.1016/j.tet.2005.09.070
日期:2006.1
The effect of bases, acids, and water as additives in proline-catalyzed ketone–aldehyde aldol reactions has been studied. While the reaction appears to be relatively tolerant to small amounts of tertiary amine bases or weak acids, it stops completely with strong acids. The use of water as an additive had a highly beneficial effect on reactions that were conducted with a stoichiometric ratio of ketone