Studies in the triazine series including a new synthesis of 1:2:4-triazines
作者:P.V. Laakso、R. Robinson、H.P. Vandrewala
DOI:10.1016/0040-4020(57)85014-5
日期:1957.1
mono-aroylhydrazones of benzil are cyclised by ammoniumacetate in hot aceticacid to tri-substituted-1:2:4-triazines. The yield is favourable and it is not necessary, or even advantageous, to isolate the presumed intermediates. The new synthesis has been applied to a sufficient range of examples to establish its status as a general method. In the case of phenanthraquinone the reaction took a more complex course and
The reaction of 1,2,4-triazines (1) and 1-cyclopentenylpyrrolidine (2) afforded 6,7-dihydro-5H-[2]-pyrindines (3) in good yields. Oxidation of 3 to the N-oxides (4), reaction of 4 with acetic anhydride to 5-acetoxy-6,7-dihydro-5H-[2]pyrindines (5) and elimination of acetic acid afforded [2]pyrindines (7). 2-Methyl-2H-[2]pyrindines (9) were also prepared.
ONE-POT SYNTHESIS OF 1,2,4-TRIAZINES
作者:Shahnaz Rostamizadeh、Kamran Sadeghi
DOI:10.1081/scc-120004086
日期:2002.1.1
1,2,4-Triazines have been prepared from the one-pot condensation reaction of acid hydrazide (1), ammonium acetate and dicarbonyl compounds (2) on the surface of silica gel in the presence of triethylamine under microwave irradiation.
NEUNHOEFFER H.; LEHMANN B.; EWALD H., J. LIEBIGS ANN. CHEM., 1977, NO 9,