driven C–H ketoalkylation of glycine derivatives and peptides with cycloalkyl hydroperoxides is presented. This protocol provides a straightforward route to unnatural amino acids bearing a distal carbonyl group with moderate to good yields. Preliminary mechanistic studies revealed that both a SET event and radical chain propagation were involved in this transformation.
Unnatural α-Amino Acid Synthesized through α-Alkylation of Glycine Derivatives by Diacyl Peroxides
作者:Hao Tian、Wentao Xu、Yuxiu Liu、Qingmin Wang
DOI:10.1021/acs.orglett.0c01574
日期:2020.7.2
We have developed a protocol for catalyst- and additive-free α-alkylationreactions of glycine derivatives with diacyl peroxides, which proceed by a pathway involving addition of alkyl radicals to imine intermediates. The diacyl peroxide substrate acts as both alkylation agent and oxidizing agent, which means it is atom-economical. It was applied to various glycine derivatives, dipeptides, and a 3
Dehydrogenative Aza-[4 + 2] Cycloaddition of Amines with 1,3-Dienes via Dual Catalysis
作者:Xiaoxiao Chen、Guoxiang Zhang、Rong Zeng
DOI:10.1021/acs.orglett.1c02558
日期:2021.9.17
We describe a synergistic utilization of copper catalysis and proton-transfer catalysis that enables an atom- and step-economical aza-[4 + 2] cycloaddition reaction of readily available N-arylamino carbonyl compounds with simple 1,3-dienes. The reaction proceeds smoothly under an air atmosphere and produces water as the sole side product. Whereas the amines can directly serve as the C- and N-atom donors
我们描述了铜催化和质子转移催化的协同利用,使容易获得的N-芳基氨基羰基化合物与简单的 1,3-二烯进行原子和步骤经济的氮杂-[4 + 2] 环加成反应。反应在空气气氛下顺利进行,并产生水作为唯一的副产物。虽然胺可以直接作为 C 和 N 原子供体,但这种操作简单的方案提供了绿色、快速和高效的 1,2,3,6-四氢吡啶,范围广泛。
Electrochemical Oxidative Phosphorylations of Glycine Derivatives with R
<sub>2</sub>
P(O)−H‐Containing Compounds via C(
<i>sp</i>
<sup>3</sup>
)−H Functionalisation
作者:Ruige Wang、Jie Wang、Yonghong Zhang、Bin Wang、Yu Xia、Fei Xue、Weiwei Jin、Chenjiang Liu
DOI:10.1002/adsc.202201198
日期:2023.3.21
electrochemical cross-coupling hydrogen-evolution chemistryinvolving glycine amides and diarylphosphine oxides. A broad range of biologically active α-aminophosphonates was obtained in moderate to good yields in a clean and sustainable manner. Moreover, the TBAB (tetrabutylammonium bromide) electrolyte was recycled four times without obvious loss of reaction activity. Moreover, this protocol was performed
Metal-free, visible-light driven α-C(sp<sup>3</sup>)–H <i>gem</i>-difluoroallylation of glycine derivatives with trifluoromethyl alkenes and 1,3-enynes
A metal free, visible-light driven α-C(sp3)−H gem-difluoroallylation of glycine derivatives with CF3-alkenes and 1,3-enynes is presented under redox-neutral conditions with good yields and excellent functional group compatibility.