Chemistry of diazocarbonyl compounds. IV. Synthesis and chemical properties of triphenylphosphoranylidenhydrazones of alkyl oxocarboxylates
Alkyl 3-diazo-2-oxopropanoates react with triphenylphosphine to form corresponding triphenylphosphoranylidenehydrazones. The latter form symmetrical azines with aromatic aldehydes. Ethyl (Z)-5-aryl-5-hydroxy-2-diazo-3-oxo-4-pentenoates under the action of
Zalesov,Vyaznikova,Andreichikov
p. 705 - 709
(2007/10/03)
SYNTHESIS of 1,2,4-TRIAZINES - XIV. Regioselective Synthesis of Ethyl 1,2,4-Triazine-5-carboxylates
Ethyl 1,2,4-triazine-5-carboxylates 6 were prepared by heating N,N-dimethylaminomethylene- or ethoxymethylenehydrazones 5 with ammonium acetate in acetic acid at 100 deg C.NMR studies confirmed the absence of their regio isomers (6-carboxylates), showing
Ohsumi, Tadashi,Neunhoeffer, Hans
p. 5227 - 5234
(2007/10/02)
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