Dual role of polyphosphoric acid-activated nitroalkanes in oxidative peri-annulations: efficient synthesis of 1,3,6,8-tetraazapyrenes
作者:Alexander V. Aksenov、Dmitrii S. Ovcharov、Nicolai A. Aksenov、Dmitrii A. Aksenov、Oleg N. Nadein、Michael Rubin
DOI:10.1039/c7ra04751g
日期:——
Electrophilically activated nitroalkanes play a dual role in the novel reaction with diaminoperimidines, promoting their oxidative peri-annulation to access tetraazapyrenes.
6(7)-Acylperimidines nitration and methods of peri-annelation on this base
作者:A. V. Aksenov、N. A. Aksenov、A. S. Lyakhovnenko、A. N. Smirnov、I. I. Levina、I. V. Aksenova
DOI:10.1007/s10593-013-1335-9
日期:2013.10
A method has been developed for the nitration of 6(7)-acylperimidines using sodium nitrite in formic acid. The reaction gives a mixture of 4(9)-, 9(4)-, and 7(6)-nitro-6(7)-acylperimidines from which the latter can be separated by extraction with chloroform. Reduction of the 6(7)-acyl-7(6)-nitro- perimidines yields 1H-1,5,7-triazacyclopenta[cd]phenalenes. Subsequent Schmidt reaction and reduction give 1,3,6,8-tetraazapyrenes.