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. 2023 Jun 27;28(13):5036. doi: 10.3390/molecules28135036

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© 2023 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Scheme 1 — Previous methods to prepare tetrazolo[1,5-a]quinolines. Method A: from 2-chloroquinoline and NaN₃ [32]; Method B: from 2-hydrazinylquinoline [29]; Method C: from 2-azidoarylidenes [31,34]; Method D: this work.