期刊
JOURNAL OF ORGANIC CHEMISTRY
卷 73, 期 4, 页码 1354-1364出版社
AMER CHEMICAL SOC
DOI: 10.1021/jo702423z
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The reaction of cerium(IV) ammonium nitrate (CAN) with a range of N-(p-anisyl)azoles in acetonitrile or methanol solvents leads to N-dearylation releasing the parent NH-azole and p-benzoquinone in comparable yields. The scope and limitations of the reaction are explored. It was successful with 1-(p-anisyl)pyrazoles, 2-(p-anisyl)-1,2,3-triazoles, 2-(p-anisyl)-2H-tetrazoles, and 1-(p-anisyl)pentazole. The dearylation renders the p-anisyl group as a potentially useful N-protecting group in azole chemistry. The azole released in solution from 1-(p-anisyl)pentazole is unstable HN5, the long-sought parent pentazolic acid. p-Anisylpentazole samples were synthesized with combinations of one, two, and three N-15 atoms at all positions of the pentazole ring. The unstable HN5/N-5(-) produced at -40 degrees C did not build up in the solution but degraded to azide ion and nitrogen gas with a short lifetime. The N-15-labeling of the N-3(-) ion obtained from all samples proved unequivocally that it came from the degradation of HN5 (tautomeric forms) and/or its anion N-5(-) in the solution.
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