Cikotiene I, Jonusis M, Jakubkiene V. The first example of the Fischer-Hepp type rearrangement in pyrimidines.
Beilstein J Org Chem 2013;
9:1819-25. [PMID:
24062848 PMCID:
PMC3778328 DOI:
10.3762/bjoc.9.212]
[Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2013] [Accepted: 08/12/2013] [Indexed: 11/23/2022] Open
Abstract
A N-nitroso moiety can be used for the activation of chloropyrimidines toward a nucleophilic substitution reaction with amines. The subsequent treatment of the obtained products with aq H2SO4 can lead to either N-denitrosation to obtain 4,6-pyrimidinediamines or to a Fischer–Hepp type rearrangement to obtain 5-nitroso-4,6-pyrimidinediamines. It was found that the outcome of the reaction strongly depends on the structure of the pyrimidines. Activation of the pyrimidine ring by three groups with a positive mesomeric effect is crucial for the intramolecular nitroso group migration.
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