Pyrazolonderivate aus Benzoylessigester

Pyrazolo[4′,3′:5,6]pyrano[2,3‐b]quinoxalin‐4(1H)‐one: Synthesis and characterization of a novel tetracyclic ring system

“…Systematic names according to IUPAC recommendations were generated with ACD/Name [16] and subsequently proved manually to ensure correct nomenclature within this publication [17]. Starting materials 1 were commercially available or prepared according to literature procedures: 1a [18], 1c [19], 1d [20]. Product yields were not optimized.…”

The Condensation of Aminoantipyrine. Iv (1). A Study of a New Color Reaction of Pyrazolons

“…Compounds not commercially obtainable were made according to directions found in the literature. The references to the preparations are listed:-4-benzylidine-l-phenyI-3methylpyrazolon-5 (6); 4-isopropylidine-l-phenyl-3-methylpyrazolon-5 (7); 4-isonitroso-lphenyl-3-methylpyrazolon-5 (8); 1-phenyl-3-methyl-4-bromopyrazolon-5 (9); 1-phenyl-3,4-dimethylpyrazolon-5 (10); l,3-diphenylpyrazolon-5 (11); 1 -phenyl-3-carboxypyrazolon-5 (12); 1-phenyl-3-hydroxypyrazolon-5 (13); 1-phenyl-3-carboxy-4-hydroxypyrazol (14); 1-phenyl-4-hydroxypyrazol (15); 3-carboxy-4-hydroxypyrazol ( 16); 4-hydroxypyrazol (17).…”

Chemistry and Tautomerism of Coupling Products of Diazotised Sulfamethoxazole with some Compounds Containing an Active Methylene Group

“…Further confirmation of 6 was obtained through its synthesis via another reaction route. Thus, reaction of diazotised sulfamethoxazole 1 with 3-methyl-1-phenyl-pyrazolin-5one 13,14 in ethanolic sodium acetate solution afforded a product which was found to be identical with 6 (the same m.p., mixed m.p. and IR spectrum).…”