Approaches to the synthesis of azonia-azulenes
Keele University, 1971
Online
Hochschulschrift
Zugriff:
Two approaches to the azonia-azulenium system are described. In Part I the preparation of a number of azepinoindoles by the thermal decomposition of 2-azidodiphenylmethanes is described. The usual products were lOH-azepino[l.2-a]indoles and the compound previously reported as llH-azepino[l,2-a]indole has been shown to exist in the tautomeric lOH-form. In one case steric obstruction led to the formation of a 6H- and an 8H-azepinoindole, and when a 2'-methoxyl group was present in the azide the major products were acridines and acridans. A mechanism is proposed which satisfactorily accounts for the observed products. l-(2-Azidophenyl)-1-phenylethanol decomposed to give some 2-acetyldiphenylamine showing another nitrene insertion. pathway. Photolytic decomposition of 2-azidodiphenylmethane gave the azo-compound. Azepino[l.2-a]indol-8-one has been prepared in good yield and converted into hydroxy- and ethoxyazepino[l,2-a]indolium salts. In Part II the reduction of indolizine and some substituted indolizines by dissolving metals is shown to give dihydro- and tetrahydroindolizines. Attempts to add carbenes to dihydroindolizines and thus to produce the 5,7 ring system of the azonia-azulenes by ring expansion were unsuccessful.
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Approaches to the synthesis of azonia-azulenes
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Autor/in / Beteiligte Person: | Cliff, Geoffrey R. |
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Veröffentlichung: | Keele University, 1971 |
Medientyp: | Hochschulschrift |
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