Three-component reaction for the synthesis of diverse β-unsaturated α-amino esters
作者:Hélio A. Stefani、Flávia Manarin、Ariane C.S. Sousa、Frederico B. Souza、Witor Ribeiro Ferraz
DOI:10.1016/j.tet.2013.11.107
日期:2014.5
We describe an efficient multicomponent reaction for the preparation of β-unsaturatedα-aminoesters by ytterbium triflate catalyzed reaction of potassium organotrifluoroborate salts, aniline and ethyl glyoxalate. The synthetic viability of this protocol was demonstrated by moderate to high yields, short reaction time ranging from 0.5 to 12 h, and efficiency with respect to substrate scope.
Ytterbium(III)-Catalyzed Addition Reaction of Alkynyltrifluoroborate Salts to α-Imino Esters: Efficient Synthesis of β-Unsaturated α-Amino Esters
作者:Hélio A. Stefani、Flávia Manarin、Amna N. Khan、Stanley N. S. Vasconcelos
DOI:10.1002/ejoc.201301421
日期:2014.2
We describe the development of a mild and efficient method for the preparation of β-unsaturatedα-aminoesters through the ytterbium triflate catalyzed addition of potassium alkynyltrifluoroboratesalts to imino esters. The synthetic viability of this protocol was supported by its high yields, short reaction times, and efficiency with regard to the scope of the substrates.