For Abstract see ChemInform Abstract in Full Text.

The synthesis and reactivity studies of 4-hydroxy-6-methyl-3-(5-phenyl-2E, 4E-p e n t a d i e n -1 -o y l ) -2H-p y r a n -2-one 2 with nucleophiles are reported. Reactions of 2 with hydrazine derivatives gave new pyrazole-type compounds while the reaction with o rt h o-phenylenediamines yielded 1,5-benzodiazepines. The reaction of 2 w i t h ethylamine implies the 2H-pyran-2-one ring opening and the formation of a strong conjugated compound 3.

No abstract

Reaction of 1,2-Diamines with 4-Hydroxycoumarin. Synthesis of 1,4-Diazepin-5-ones.-Acetylation of the title diazepines takes places on all possible sites, cf. derivative (V), except in the case of sterically hindered diazepines, e.g.(XI). -(HAMDI, M.; COTTET, S.; TEDESCHI, C.; SPEZIALE, V.; J.

Die Nitrierung des Pyrons (I) erfolgt selektiv über (II) zu dem Nitroderivat (III).