Redox deracemization of β,γ-alkynyl α-amino esters
作者:Lu Zhang、Rongxiu Zhu、Aili Feng、Changyin Zhao、Lei Chen、Guidong Feng、Lei Liu
DOI:10.1039/d0sc00944j
日期:——
The first non-enzymatic redox deracemization method using molecular oxygen as the terminal oxidant has been described. The one-pot deracemization of β,γ-alkynyl α-amino esters consisted of a copper-catalyzed aerobic oxidation and chiral phosphoric acid-catalyzed asymmetric transfer hydrogenation with excellent functional group compatibility. By using benzothiazoline as the reducing reagent, an exclusive
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.