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Zhulanov VE, Vigovskaya VA, Dmitriev MV, Silaichev PS, Maslivets AN, Rubin M. Dipyrazolodioxadiazocines as shelf-stable "ready-to-use" precursors for an in situ generation of enolate-iminium 1,4-dipoles: a straightforward atom-economical approach to pyrazolo[5,1-d][1,3,5]dioxazines. Org Biomol Chem 2020; 18:3382-3391. [PMID: 32323682 DOI: 10.1039/d0ob00451k] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An original, facile and highly efficient method for the in situ generation of cyclic enolate-iminium 1,4-dipoles via unique thermal decomposition of easily available dipyrazolodioxadiazocines has been developed. Various substituted pyrazolo[5,1-d][1,3,5]dioxazines have been prepared in high yields via unusual cycloconversion of dipyrazolodioxadiazocines in the presence of ketones. Furthermore, the developed method is 100% atom economical and proceeds under metal-, catalyst- and solvent-free conditions.
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Affiliation(s)
- Vladimir E Zhulanov
- Department of Chemistry, Perm State University, ul. Bukireva 15, Perm, 614990, Russian Federation.
| | - Valeria A Vigovskaya
- Department of Chemistry, Perm State University, ul. Bukireva 15, Perm, 614990, Russian Federation.
| | - Maksim V Dmitriev
- Department of Chemistry, Perm State University, ul. Bukireva 15, Perm, 614990, Russian Federation.
| | - Pavel S Silaichev
- Department of Chemistry, Perm State University, ul. Bukireva 15, Perm, 614990, Russian Federation.
| | - Andrey N Maslivets
- Department of Chemistry, Perm State University, ul. Bukireva 15, Perm, 614990, Russian Federation.
| | - Michael Rubin
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin St., Stavropol 355009, Russian Federation and Department of Chemistry, University of Kansas, 1567 Irving Hill Rd., Lawrence, KS 66045-7582, USA.
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