An easy access to 2-oxohydrazones via electrophilic α-p-tolylhydrazonylation of ketone enolates with tert-butyl p-tolylazo sulfide
摘要:
The title reaction conveniently furnishes, as the sole or main products, alpha-(p-tolylhydrazono)ketones or their N-methylderivatives (H+ or Mel quenching of the final mixture, respectively). Although the method fails with ketones having a secondary alkyl group bonded to the carbonyl, yields are otherwise more than satisfactory and particular interest is attached to the hydrazonylation of the methyl group in methyl ketones.
The title reaction conveniently furnishes, as the sole or main products, alpha-(p-tolylhydrazono)ketones or their N-methylderivatives (H+ or Mel quenching of the final mixture, respectively). Although the method fails with ketones having a secondary alkyl group bonded to the carbonyl, yields are otherwise more than satisfactory and particular interest is attached to the hydrazonylation of the methyl group in methyl ketones.
Etude des conditions D'accés aux 6,11-dihydro-5<i>H</i>-pyrimidino[4,5-<i>a</i>]carbazoles
Les tétrahydrocarbazolones 15-27 sont obtenues par cyclisation des phénylhydrazones 2-14. La cyclisation de ces carbazolones 15-27 qui est opérée au moyen du triformarnidométhane dans le formamide fournit les dihydropyrimidinocarbazoles 28-40. Les spectres de rmn enregistrés dans le DMSO-d6 confirment la structure des dérivés obtenus.