Abstract
The alkylation of 1H-tetrazole, 5-methyl-1H-tetrazole, and 5-phenyl-1H-tetrazole with primary, secondary, and tertiary alcohols, including benzylic and allylic ones, have been studied in 1,2-dichloroethane in the presence of boron trifluoride–diethyl ether complex. Neither primary nor secondary saturated alcohols alkylated tetrazoles in the given system. Tertiary alcohols such tert-butyl alcohol and adamantan-1-ol reacted with unsubstituted and 5-substituted tetrazoles to give 70–85% of the corresponding 2-alkyl-5-R-tetrazoles with high regioselectivity. The alkylation of 1H-tetrazole with benzyl alcohol afforded 55% of 2-benzyl-2H-tetrazole as the only product. The alkylation of 1H-tetrazole with various allylic alcohols led to the formation of mixtures of 2-alkyl-2H-tetrazoles with isomeric alkyl substituents.
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ACKNOWLEDGMENTS
This study was performed using the facilities of the Engineering Center of the St. Petersburg State Institute of Technology.
Funding
This study was performed under financial support by the Ministry of Science and Higher Education of the Russian Federation (state assignment no. 0785.00.X06019).
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Egorov, S.A., Ishchenko, M.A., Prokopovich, Y.V. et al. Alkylation of 5-Substituted Tetrazoles with Various Alcohols in 1,2-Dichloroethane in the Presence of BF3·Et2O. Russ J Org Chem 56, 1196–1203 (2020). https://doi.org/10.1134/S107042802007012X
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DOI: https://doi.org/10.1134/S107042802007012X