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Article
Covalent Amination. Substituent Effects on the Site of Addition of Ammonia to Quaternized Pyridines and Pyrazines
Journal of Organic Chemistry
  • John A. Zoltewicz
  • Larry S. Helmick, Cedarville University
  • John K. O'Halloran
Document Type
Article
Publication Date
1-1-1976
Abstract

1,3-Disubstituted pyridinium ions react completely at about -40 "C with ammonia to give covalent amination products. Addition occurs at C-6 when the C-3 group is CONH2, C02CH3, CF3, or COCH3. Addition at C-2 results when the 3 substituent is C1 or I, and a mixture is found for the 3-CN compound. Parent 1-methyl- and l-benzylpyridinium ions do not yield 2 adducts unless powdered KOH is added to neutralize ammonium ion. 1-Methoxypyridinium ions at -50 "C give adducts which open to 5-amino-2(cis),4(trans)-pentadienalo xime 0-methyl ether. 1-Methyl-3-substituted pyrazinium ions react at the 2 position when the substituent is C1 or CH30 and at the 6 position in the CONHz case. 1-Methylpyrazinium ion first forms a 2 adduct and then a 2,3 diadduct.

Disciplines
Keywords
  • Amination,
  • pyridines,
  • pyrazines
Citation Information
Helmick, L. S. (1976). Covalent Amination: Substitution Effects on the Site of Addition of Ammonia to Quaternized Pyridines and Pyrazines. Journal of Organic Chemistry, 41, 1303-1308.