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DOI: 10.1055/s-0040-1706568
Application of Azide-Tetrazole Tautomerism and Arylsulfanyl Group Dance in the Synthesis of Thiosubstituted Tetrazoloquinazolines
This work is supported by the Central Finance and Contracting Agency of the Republic of Latvia (ERDF 1.1.1.1. activity project No. 1.1.1.1/16/A/131).


Abstract
Nucleophilic aromatic substitution reaction between 4-arylthio-2-chloroquinazolines and NaN3 takes place with an unusual sulfanyl group dance and leads to the formation of 5-(arylthio)tetrazolo[1,5-c]-quinazolines, which do not form the azide tautomer and do not undergo CuAAC reactions with alkynes. On the other hand, 5-azidotetrazolo[1,5-a]quinazoline (formally described as 2,4-diazidoquinazoline) undergoes regioselective nucleophilic aromatic substitution with thiols at C5 and forms 5-(alkyl/arylthio)tetrazolo[1,5-a]quinazolines, the structure of which has been proved by X-ray crystallography. The latter exist in tautomeric equilibrium with their 2-azidoquinazoline form, which provides possibility for copper-catalyzed azide–alkyne 1,3-dipolar cycloaddition reaction, leading to the 4-alkyl/arylthio-2-(1H-1,2,3-triazol-1-yl)quinazolines.
Key words
quinazolines - nucleophilic aromatic substitution - azide-tetrazole equilibrium - thiols - azides - triazolesSupporting Information
- Supporting information for this article is available online at https://doi.org/10.1055/s-0040-1706568.
- Supporting Information
Publication History
Received: 14 July 2020
Accepted after revision: 06 October 2020
Article published online:
12 November 2020
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