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Safieh, Kayed A. Abu; El-Abadelah, Mustafa M.; Zarga, Musa H. Abu; Sabri, Salim S.; Voelter, Wolfgang; MÖssmer, Cäcilia M.
Journal of heterocyclic chemistry, May/June 2001, Volume: 38, Issue: 3Journal Article
The synthesis of some new pyrazolo3′,4′:6,7azepino5,4,3‐cd indoles (10a‐c) was achieved via regios‐elective cyclization of the respective 3‐(4‐acylaminopyrazol‐5‐yl)indoles (9a‐c) under Bischler‐Napieralski reaction conditions. The latter compounds were obtained by acylation of the corresponding 3‐(4‐aminopyra‐zol‐5‐yl)indoles (8a,b) which, in turn, were prepared by reduction of the 3‐(4‐nitropyrazol‐5‐yl)indoles precursors (7a,b). The latter synthons were accessible from the reaction of indolylzinc chlorides (5a,b) with 5‐chloro‐1,3‐dimethyl‐4‐nitropyrazole. Ms and nmr spectral data of 10a‐c are in agreement with the assigned azepino‐indole structure as determined for 10a by X‐ray crystal measurements which demonstrate that the azepine ring is almost completely planar with the indole and pyrazole rings.
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