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.
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.
we report a Cu-catalyzed redox isomerization-reductive deuteration sequence, providing facile access to a range of α-deuterated amino acidesters featuring an Z-configured alkene moiety with high yields. The advantages of this sequence include mild conditions, broad substrate scope, and excellent stereoselectivity. This research also represents a rare example of the Z-selective redox isomerization of