Simple Synthesis of Quinoxalin-2(1<i>H</i>)-one<i>N</i>-Oxides from<i>N</i>-Aryl-2-nitrosoanilines and Alkylated Cyanoacetic Esters
作者:Magdalena Królikiewicz、Zbigniew Wróbel
DOI:10.1002/jhet.1947
日期:2014.1
N‐Aryl‐2‐nitrosoanilines, available from the reaction of N‐arylamines with nitroarenes, condense under alkaline conditions with alkylated derivatives of cyanoacetic esters furnishing quinoxalin‐2(1H)‐one N‐oxides in good to excellent yields. The reaction involves the condensation of the carbanion with the nitroso group leading to the nitrone intermediate, followed by intramolecular acylation of the
Methyl compounds are prepared from carbon acids by reaction with dimethyl carbonate in the presence of a nitrogen-containing base.
甲基化合物是通过在含氮碱存在的情况下,将碳酸与二甲醇反应制备而成的。
A Short Preparation of Pyrroloquinoxalinones via a Cascade Reaction of N-Aryl-5-alkylamino-2-nitrosoanilines with Methyl 2-Cyanoalkanoates: Unexpected Direction of Nucleophilic Substitution of Hydrogen
N-Aryl-2-nitrosoanilines possessing 5-alkylamino groups undergo a bisheteroannulation reaction with anions of 2-cyanoalkanecarboxylates resulting in pyrroloquinoxalinone derivatives. The cascade reaction involves condensation of the cyanoester anions with the nitroso group, unusual nucleophilic substitution of hydrogen in the nitrosoaniline-derived intermediate with the second carbanion molecule, and double intramolecular acylation of the amino functions.
ONO NOBORU; YOSHIMURA TETSUJI; TANIKAGA RIKUHEI; KAJI ARITSUNE, CHEM. LETT., 1977, NO 8, 871-872