Stereodivergent Synthesis of α-Quaternary Serine and Cysteine Derivatives Containing Two Contiguous Stereogenic Centers via Synergistic Cu/Ir Catalysis
作者:Hui-Min Wu、Zongpeng Zhang、Fan Xiao、Liang Wei、Xiu-Qin Dong、Chun-Jiang Wang
DOI:10.1021/acs.orglett.0c01687
日期:2020.6.19
A stereodivergent preparation of α-quaternary serine/cysteinederivatives incorporating two adjacent stereogenic centers has been developed through Cu/Ir-catalyzed asymmetric allylation of 2-oxazoline-4-carboxylates and 2-thiazoline-4-carboxylates. Tuning the electronic effect is the key to enhancing the reactivity of 2-oxazoline-4-carboxylates and suppressing the undesired β-elimination. The salient
Asymmetric synthesis of quaternary α-trifluoromethyl α-amino acids by Ir-catalyzed allylation followed by kinetic resolution
作者:Xi-Shang Sun、Qiu Ou-Yang、Shi-Ming Xu、Xing-Heng Wang、Hai-Yan Tao、Lung Wa Chung、Chun-Jiang Wang
DOI:10.1039/d0cc00845a
日期:——
Facile access to quaternary α-trifluoromethyl α-amino acids has been developed. This sequential reaction involves an Ir-catalyzed asymmetric allylation of α-trifluoromethyl aldimine esters followed by an unprecedented kinetic resolution.
Stereodivergent Synthesis of α,α-Disubstituted α-Amino Acids via Synergistic Cu/Ir Catalysis
作者:Liang Wei、Qiao Zhu、Shi-Ming Xu、Xin Chang、Chun-Jiang Wang
DOI:10.1021/jacs.7b12174
日期:2018.1.31
Cu/Ir dualcatalysis has been developed for the stereodivergent α-allylation of aldimine esters. The method enables the preparation of a series of nonproteinogenic α-amino acids (α-AAs) bearing two contiguous stereogenic centers in high yield with excellent stereoselectivity. All four product stereoisomers could be obtained from the same set of starting materials via pairwise combination of two chiral