An economical, simple, and efficient direct aldol reaction via the double activation of both aldehydes and ketones by ammonia has been developed. An unprecedented tandem Mannich reaction was observed when hydroxybenzaldehydes, pyrrole-2-carboxyaldehyde, and indole-3-carboxyaldehyde were employed to afford 2,2-dimethyl-6-aryl-4-pyrilidinones in moderate to good yields.
Dibutyltin dimethoxide-catalyzed aldol reaction of enol trichloroacetates
作者:Akira Yanagisawa、Takayuki Sekiguchi
DOI:10.1016/s0040-4039(03)01840-9
日期:2003.9
A catalytic aldol condensation of aldehydes with enol trichloroacetates was achieved usingdibutyltindimethoxide as a novel catalyst in a mixed solvent consisting of THF and MeOH. Various β-hydroxy ketones were diastereoselectively obtained in high yields up to 99%.
The Aldol Reaction of Silyl Enol Ethers with Aldehydes in Aqueous Media
作者:Shū Kobayashi、Iwao Hachiya
DOI:10.1016/s0040-4039(00)91691-5
日期:1992.3
The aldol reaction of silyl enol ethers with aldehydes is successfully carried out in aqueous media by using a lanthanide trifluoromethanesulfonate as a catalyst. Water soluble aldehydes are applicable and the catalyst can be recovered and reused in this reaction.
Chiral Brønsted Acid as a True Catalyst: Asymmetric Mukaiyama Aldol and Hosomi–Sakurai Allylation Reactions
作者:Masahiro Sai、Hisashi Yamamoto
DOI:10.1021/jacs.5b04168
日期:2015.6.10
diastereo- and enantioselective Mukaiyama aldol reaction catalyzed by a new chiral Brønsted acid, N-(perfluorooctanesulfonyl)thiophosphoramide, is described. The perfluorooctyl substituent on the sulfonyl group of the catalyst plays an essential role in the stereoselection. The catalyst also allows the asymmetric Hosomi-Sakurai allylation, which has been considerably challenging due to the low reactivity of
Samarium Ion-Promoted Cross-Aldol Reactions and Tandem Aldol/Evans−Tishchenko Reactions
作者:Ling Lu、Hung-Yu Chang、Jim-Min Fang
DOI:10.1021/jo981675b
日期:1999.2.1
effective Lewis acids to catalyze tandem aldol/Evans-Tishchenko reactions. The aldol/Evans-Tishchenko reactions of methyl ketones with aldehydes occurred at 0 degrees C to give alpha,gamma-anti diol monoesters 53a-59a. When the reactions were conducted at room temperature, a certain degree of transesterification took place. The aldol/Evans-Tishchenko reactions of ethyl or benzyl ketones with aldehydes