A chiralaldehyde is rationally combined with a Lewis acid and a transition metal for the first time to form a triple catalytic system. This cocatalytic system exhibits good catalytic activation and stereoselective-control abilities in the asymmetric α-allylation reaction of N-unprotected amino acid esters and allyl acetates. Optically active α,α-disubstituted α-amino acids (α-AAs) are generated in
Enantioselective construction of 2,5-dihydropyrrole skeleton with quaternary stereogenic center via catalytic asymmetric 1,3-dipolar cycloaddition involving α-arylglycine esters
作者:Feng Shi、Gui-Juan Xing、Wei Tan、Ren-Yi Zhu、Shujiang Tu
DOI:10.1039/c2ob26566d
日期:——
A catalyticasymmetricconstruction of synthetically and biologically important 2,5-dihydropyrrole scaffolds with concomitant creation of multiple chiral carbon centers including one quaternary stereogenic center in high yields (up to 99%) and excellent enantioselectivities (up to 99% ee) has been established via an organocatalytic 1,3-dipolarcycloaddition using α-arylglycine esters as azomethine precursors
Biphenyl aldehyde-based ternary catalytic system catalyzed Tsuji–Trost allylation of N-unprotected amino acid esters
作者:Zhao-Wei Wu、Wei Wen、Qi-Xiang Guo
DOI:10.1016/j.tet.2022.133235
日期:2023.2
the direct α-allylation reaction of N-unprotected amino acid esters and allyl alcohol acetates. The chemoselectivity of C-allylation and N-allylation is efficiently controlled and various racemic α,α-disubstituted amino acid esters are generated in good-to-high yields. The target products can be readily converted into structurally diverse α,α-disubstituted amino acids at a gram scale.