Du Z, Si C, Li Y, Wang Y, Lu J. Improved synthesis of 5-substituted 1H-tetrazoles via the [3+2] cycloaddition of nitriles and sodium azide catalyzed by silica sulfuric acid.
Int J Mol Sci 2012;
13:4696-4703. [PMID:
22606004 PMCID:
PMC3344240 DOI:
10.3390/ijms13044696]
[Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2012] [Revised: 03/19/2012] [Accepted: 03/30/2012] [Indexed: 11/18/2022] Open
Abstract
A silica supported sulfuric acid catalyzed [3+2] cycloaddition of nitriles and sodium azide to form 5-substituted 1H-tetrazoles is described. The protocol can provide a series of 5-substituted 1H-tetrazoles using silica sulfuric acid from nitriles and sodium azide in DMF in 72%–95% yield.
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