In a convenient and efficient procedure for the solvent-free synthesis of β-hydroxy esters and β-amino esters, various aldehydes and aldimines undergo a Reformatskyreaction mediated by non-activated indium at room temperature to give the corresponding esters in good to excellent yields.
l-amino acids in catalysis has been investigated for the two-component Mannich reactions between dimethyl malonate (DMM)/ethyl acetoacetate (EAA) and imines. As catalysts, l-amino acids performed well, even better than corresponding base catalysts and provided the β-amino carbonyl compounds in very high yields. Density functional calculations were used to gain the mechanistic insight of the reaction. High
A Catalytic Amount of Titanium Tetrahalide as Promoter for the Addition Reaction of Silyl Ketene Acetals to Imines
作者:Makoto Shimizu、Kouji Kume、Tamotsu Fujisawa
DOI:10.1246/cl.1996.545
日期:1996.7
In the presence of a catalytic amount of TiBr4 or TiI4, the reaction of silylketeneacetals with imines smoothly proceeds to give the corresponding β-amino esters in high yield with high anti-sele...
HBF<sub>4</sub> Catalyzed Mannich-Type Reaction in Aqueous Media
作者:Takahiko Akiyama、Jun Takaya、Hirotaka Kagoshima
DOI:10.1055/s-1999-2789
日期:1999.7
HBF4 catalyzed Mannich-type reaction took place smoothly in aqueous media to afford beta-amino carbonyl compounds in high yields. One-pot synthesis of beta-amino carbonyl compounds from aldehyde and amine also worked well.