Synthesis of 2-Aminoquinoxalines via One-Pot Cyanide-Based Sequential Reaction under Aerobic Oxidation Conditions
摘要:
A highly efficient synthesis of 2-aminoquinoxalines has been developed via the one-pot two-step cyanide-mediated sequential reactions of ortho-phenylenediamines with aldehydes under aerobic oxidation conditions. A variety of substrates, including aliphatic aldehydes bearing acidic a-protons, are applicable to this protocol and afford the desired 2-aminoquinoxalines in high yields.
A reaction of 1,2-diamines and aldehydes with silyl cyanide as cyanide pronucleophile to access 2-aminopyrazines and 2-aminoquinoxalines
作者:Sankar K. Guchhait、Garima Priyadarshani、Nikhil M. Gulghane
DOI:10.1039/c6ra12028h
日期:——
A new condensation reaction of ethylene-1,2-diamines or o-phenylenediamines and aromatic aldehydes with TMSCN as a cyanide-pronucleophile is documented. The reaction proceeds through a tandem sequence of desilylation, Strecker reaction, amidine-forming cyclization and dehydrogenative aromatization, and provides a straightforward synthetic route to access synthetically and biologically important motifs
记录了乙烯-1,2-二胺或邻苯二胺与芳族醛与TMSCN作为氰化物-亲核试剂的新缩合反应。该反应通过去甲硅烷基化,斯特雷克反应,形成idine的环化反应和脱氢芳构化反应的串联序列进行,并提供了直接的合成路线,可接近合成和生物学上重要的基序,3-芳基取代的2-氨基吡嗪和2-氨基喹喔啉。DBU具有独特的功能和加速作用,使得实现涉及多个C–C / N / Si键形成/断裂事件的反应成为可能。有趣的是,该协议已启用所需的串联路径,而仅从常规转换中进行切换。
Synthesis of 2-Aminoquinoxalines via One-Pot Cyanide-Based Sequential Reaction under Aerobic Oxidation Conditions
作者:Yeon-Ho Cho、Kyung-Hee Kim、Cheol-Hong Cheon
DOI:10.1021/jo4021908
日期:2014.2.7
A highly efficient synthesis of 2-aminoquinoxalines has been developed via the one-pot two-step cyanide-mediated sequential reactions of ortho-phenylenediamines with aldehydes under aerobic oxidation conditions. A variety of substrates, including aliphatic aldehydes bearing acidic a-protons, are applicable to this protocol and afford the desired 2-aminoquinoxalines in high yields.
We present the PIFA-mediated intramolecular N-arylation of 2-aminoquinoxalines at room temperature for the first time. This method provides a wide range of indolo[2,3-b]quinoxalines in good to excellent yields within a short time. The C–H bond functionalization occurs without the need for an inert atmosphere or additives. Additionally, a double C–H bond functionalization was observed, where the first