Oxidative peptide bond formation of glycine–amino acid using 2-(aminomethyl)malononitrile as a glycine unit
作者:Xiaoling Wang、Jing Li、Yujiro Hayashi
DOI:10.1039/d1cc00130b
日期:——
of glycine–amino acid was synthesized by coupling of substituted 2-(aminomethyl)malononitrile as a C-terminal glycine unit and N-terminal amine using CsOAc and O2 in an aqueous solution. This is a coupling reagent-free and catalyst-free peptide synthesis via oxidative amide bond formation. Various tripeptides and tetrapeptides were synthesized efficiently and the sulfide moiety is inert even under
Natural amino acid salt catalyzed aldol reactions of isatins with ketones: highly enantioselective construction of 3-alkyl-3-hydroxyindolin-2-ones
作者:Gong Chen、Yuan Ju、Tao Yang、Zicheng Li、Wei Ang、Zitai Sang、Jie Liu、Youfu Luo
DOI:10.1016/j.tetasy.2015.07.008
日期:2015.9
The asymmetric synthesis of 3-alkyl-3-hydroxyindolin-2-ones via direct aldolreaction of isatin with ketones catalyzed by natural amino acid salts is described, in which the phenylalanine lithium salt was found to be the best catalyst. This strategy was then applied to a variety of isatin and ketone substrates and the corresponding aldol products were obtained in excellent yields (up to 97%) with good