Site-Selective N-Dealkylation of 1,2,3-Triazolium Salts: A Metal-Free Route to 1,5-Substituted 1,2,3-Triazoles and Related Bistriazoles

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• 作者：Zaira Monasterio ; Aitziber Irastorza ; José I. Miranda ; Jesus M. Aizpurua
• 刊名：Organic Letters
• 出版年：2016
• 出版时间：May 20, 2016
• 年：2016
• 卷：18
• 期：10
• 页码：2511-2514
• 全文大小：364K
• 年卷期：0
• ISSN：1523-7052

文摘

N3-Alkylation of 1-(pivaloyloxymethyl)-1,2,3-triazoles with alkyl triflates carrying latent “click” functionality, followed by a nucleophile-promoted N1-dealkylation of the resulting strongly electrophilic intermediate triazolium salts, provides an efficient route to 1,5-disubstituted 1,2,3-triazoles. The azide and alkyne groups incorporated by N-alkylation can be submitted to further copper-catalyzed azide–alkyne and Huisgen cycloadditions to provide bis(1,2,3-triazoles) with unprecedented 1,5/1,4 substitution patterns.