| Abstract
| - The synthesis, spectroscopic properties, and chemical reactions of the stable (neopentylimino)-,(mesitylimino)-, and (o-tert-butylphenylimino)propadienones (6) are reported. Nucleophilic additionof amines affords the malonic amidoamidines 7 and 8. 3,5-Dimethylpyrazole reacts analogously toform 9b. Addition of 1,2-dimethylhydrazine produces pyrazolinones 10−12. Addition of N,N‘-dimethyldiaminoethane, -propane, and -butane gives diazepine, diazocine, and diazonine derivatives13−15, respectively (X-ray structures of 13c, 14a, and 15a are available). The mesoionicpyridopyrimidinium olates 18 are obtained by addition of 2-(methylamino)pyridine (X-ray structureof 18b available). Primary 2-aminopyridines afford the pyridopyrimidininones 20−29 and 31(X-ray structure of 21a available), and 2-aminopyrimidines and 2-aminopyrazine afford pyrimidopyrimidinones and pyrazinopyrimidinones 33−35. Pyrimidoisoquinolinone 36 results from1-aminoisoquinoline and pyridoquinolinone 40 from 8-aminoquinoline. 2-Aminothiazoline and2-aminothiazole afford thiazolopyrimidinone derivatives 41−43 (X-ray structure of 43a available).
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