The reactions of 3-aryl-1,2,4-triazines with beta-aminovinyl ketones or ethyl beta-amino-crotonates in acetic anhydride at room temperature afforded cyclic products of the tandem nucleophilic addition, viz., 3a,4,7,7a-tetrahydro-1H-pyrrolo[3,2-e]-1,2,4-triazines, in good yields. Under oxidative conditions, the latter compounds underwent the pyrrole-ring opening under the action of potassium permanganate to form the corresponding triazinones and were transformed into thriazolyl-substituted pyridines under the action of selenious acid.
Aminovinyl ketones and aminovinyl esters as CCN building blocks for the synthesis of 1H-pyrrolo[3,2-e]1,2,4-triazines
摘要:
5,6-Unsubstituted-3-aryl-1,2,4-triazines were found to react with aminovinyl ketones and aminovinyl esters in acetic anhydride to form derivatives of 3a,4,7,7a-tetrahydro-1H-pyrrolo[3,2-e]1,2,4-triazines in good yields. (C) 2003 Elsevier Science Ltd. All rights reserved.