Absb~& Reaction of arylglycxal with 1,2-diaminopyridinium salt 1 under acidic conditions afforded 2-arylpyiido[l,2-b]-as-triazinium salt 9 selectively, whereas cyclization of the same dioxo compound with l-amino-2iminopyridine 5 under neutral conditions -due to "umpolung" of the exo nitrogen atom -l
β¦ LIBER β¦
Synthesis of pyrido [1,2-b]-[1,2,4]-triazinium salts
β Scribed by N. V. Baranova; A. K. Sheinkman; A. N. Kost
- Book ID
- 112331606
- Publisher
- Springer US
- Year
- 1970
- Tongue
- English
- Weight
- 57 KB
- Volume
- 6
- Category
- Article
- ISSN
- 0009-3122
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With sodium borohydride in tetrahydrofuran/ethanol (5 : 1). the product ( I ) gives a 75 yield of a compound, m.p. 233 "C, that is identical with the recently prepared 2-(diphenylmethyl)imidaz0le[~1. When product ( I ) is boiled for 2 h in tetrahydrofuran/water (2: I ) it affords 2-(hydroxy-dipheny