作者:Mahlegha Shamsi、Mehdi M. Baradarani、Arash Afghan、John A. Joule
DOI:10.3998/ark.5550190.0012.918
日期:——
The synthesis of acridan-fused quinoxalines, 10,14b-dihydro-1,6,14b-triazanaphth(a)- aceanthrylenes, 10,14b-dihydro-1,2,6,14b-tetraazanaphth(a)aceanthrylene, 10,14b-dihydro- 1,5,6,14b-tetraazanaphth(a)aceanthrylene and the acridan-fused pyrazine, 2,3-dicyano-8,12b- dihydro-1,4,12b-triazabenz(a)aceanthrylene, is described.
Arylnitrene cyclisations by way of 6-membered spiro intermediates. The formation of carbazoles, acridines, and acridones from aryl 2-azidobenzoates
作者:Michael G. Clancy、Masoud M. Hesabi、Otto Meth–Cohn
DOI:10.1039/c39800001112
日期:——
Aryl2-azidobenzoates undergo vapour-phase pyrolysis to give carbazoles in moderate yield: alternatively, 4-methylacridan and acridone are formed from 2,6-dimethylphenyl and salicyl 2-azidobenzoates respectively, all the products being derived from6-membered spirobenz[1,3]oxazinone intermediates.
An efficient and convenient palladium-catalyzed reductive system by employing sodium hydride as the hydrogen donor and acetic anhydride as an activator has been developed for transfer hydrogenation and acetylation of a wide range of N-heteroarenes including quinoline, phthalazine, quinoxaline, phenazine, phenanthridine, and indole. Moreover, acridine substrates could be directly reduced without the