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
Visible-light induced decarboxylative alkylation of quinoxalin-2(1<i>H</i>)-ones at the C3-position
作者:Wenxuan Xue、Yingpeng Su、Ke-Hu Wang、Rong Zhang、Yawei Feng、Lindan Cao、Dangfeng Huang、Yulai Hu
DOI:10.1039/c9ob01169b
日期:——
simple and efficient method for the visible light induced direct carbon alkylation of quinoxalin-2(1H)-ones at the C3 position is described. This protocol employs cheap and readily available phenyliodine(III) dicarboxylates as the alkylation reagents to conduct decarboxylative radical coupling reaction with quinoxalin-2(1H)-ones. The process exhibits excellent compatibility to functional groups and
The visible-light-triggered regioselective alkylation of quinoxalin-2(1<i>H</i>)-ones <i>via</i> decarboxylation coupling
作者:Hongdou Zhang、Jun Xu、Min Zhou、Jianming Zhao、Pengfei Zhang、Wanmei Li
DOI:10.1039/c9ob02203a
日期:——
An efficient protocol to synthesize 3-alkylated quinoxalin-2(1H)-ones through photocatalytic decarboxylation coupling reactions of quinoxalin-2(1H)-ones with N-hydroxyphthalimide ester was developed.
Organophotoredox and Hydrogen Atom Transfer Cocatalyzed C–H Alkylation of Quinoxalin-2(1<i>H</i>)-ones with Aldehydes, Amides, Alcohols, Ethers, or Cycloalkanes
作者:Liling Wang、Zhaoxing Chen、Guohua Fan、Xiaozu Liu、Peijun Liu
DOI:10.1021/acs.joc.2c01967
日期:2022.11.4
with hydrogen atom transfer to enable C–H alkylation of quinoxalin-2(1H)-ones with feedstock aldehydes, amides, alcohols, ethers, or cycloalkanes. This reaction occurred under environmentally benign and external oxidant-free reaction conditions, providing a general and sustainable access to various C3-alkylated quinoxalinone derivatives with broad substituent diversity and good functional group compatibility
描述了一种温和的方法,将有机光氧化还原催化与氢原子转移相结合,使 quioxalin-2(1 H )-ones 与原料醛、酰胺、醇、醚或环烷烃发生 C–H 烷基化。该反应发生在环境友好且无外部氧化剂的反应条件下,为获得具有广泛取代基多样性和良好官能团相容性的各种 C3-烷基化喹喔啉酮衍生物提供了普遍和可持续的途径。
Alkyl radicals from diacyl peroxides: metal-/base-/additive-free photocatalytic alkylation of <i>N</i>-heteroaromatics
Alkyl diacyl peroxides were demonstrated to be efficient alkylating reagents for the visible-light-induced 4CzIPN-catalyzed direct C–H alkylation of N-heteroaromatics. With this metal-/base-/additive-free photocatalytic system, 57 examples of alkylated N-heteroaromatics scaffolds including 1,2,4-triazine-3,5(2H,4H)-diones (i.e. azauracils), quinoxalin-2(1H)-ones, 2H-benzo[b][1,4]oxazin-2-ones and quinoxalines
烷基二酰基过氧化物被证明是可见光诱导的 4CzIPN 催化的N-杂芳烃直接 C-H 烷基化的有效烷基化试剂。利用这种不含金属/碱/添加剂的光催化系统,57个烷基化N-杂芳族化合物支架的例子包括1,2,4-三嗪-3,5(2 H ,4 H )-二酮(即氮尿嘧啶)、喹喔啉-成功合成了2(1 H )-酮、2 H-苯并[ b ][1,4]恶嗪-2-酮和喹喔啉。