ISSN:
0021-8383
Schlagwort(e):
Chemistry
;
Organic Chemistry
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
Notizen:
Synthesis and Reaction Behaviour of 2-Arylhydrazono-N-phenyl-succinimides2-Arylhydrazono-N-phenyl-succinimides 4a-f are prepared by the heating of 2-ethoxycarbonyl-3-hydroxy-N-phenyl-maleimid 1 with arylhydrazines or ammonium salts 2a-c in acetic acid. The Knoevenagel condensation of the methyleneactive compound 4a with aldehydes in the presence of pyridine forms the corresponding Z-isomers 5a-e.The succinimides 4a-c are deprotonated to the anions 6a-c, which with heterocumulenes give the new keten-S,S- and keten-S,N-acetals 7a-c, 8a-c and (Z/E)-9a, b. The intramolecular cyclization of 7b and (Z/E)-9b leads to 1,5-disubstituted pyrazol-3,4-dicarboxylic imides 10a, b. Further derivatives of these heterocyclic series are available by a base promoted opening of the imid ring.
Zusätzliches Material:
4 Tab.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/prac.19873290411
