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.
m-chloroperoxybenzoic acid (MCPBA) is used to cleave the indole 2,3-double bond that this system contains. This results in a competition between two processes, oxidative cleavage of the double bond and a pinacol-typerearrangement, both of which occur with very high diastereoselectivity. The balance between the two processes is studied as a function of the substrate structure. Extensive use of X-ray crystallographic