Hypervalent iodine(<scp>iii</scp>)-promoted N-incorporation into N-aryl vinylogous carbamates to quinoxaline diesters: access to 1,4,5,8-tetraazaphenanthrene
作者:A. Sagar、Shinde Vidaycharan、Anand H. Shinde、Duddu S. Sharada
DOI:10.1039/c6ob00447d
日期:——
A novel oxidative N-incorporation strategy for synthesis of quinoxaline diesters under metal-free conditions is described for the first time. The mild reaction conditions allow for this transformation via the formation of two C(sp2)–N bonds utilizing cheaply available NaN3 as the N-atom source. N-Aryl vinylogous carbamates in this study undergo azidation at enamino C(sp2)–H selectively. The robustness
Hypervalent iodine(iii)-induced oxidative [4+2] annulation of o-phenylenediamines and electron-deficient alkynes: direct synthesis of quinoxalines from alkyne substrates under metal-free conditions
Hypervalent iodine(III)-induced oxidative [4+2] annulation of o-phenylenediamines and electron-deficient alkynes under metal-free conditions has been developed. The reaction allows for direct access to quinoxalines bearing two electron-withdrawing groups in an efficient manner.
An electrochemical tandem oxidative azidation and intramolecular cyclization strategy for the synthesis of quinoxaline derivatives
作者:Kai Zhou、Shendan Xia、Zhiwei Chen
DOI:10.1039/d3ob00558e
日期:——
An electrochemical-oxidation-induced intramolecular annulation for the synthesis of quinoxalines was developed under undivided electrolytic conditions. N-Aryl enamines and TMSN3 as the starting materials could smoothly participate in the transformation to achieve the construction of two C–N bonds through tandem azidation and cyclic amination reactions. The reaction could be easily handled and avoided