oxidation of acronycine (1) led to keto alcohol 4 which could be reduced to trans-1,2-dihydroxy-1,2-dihydroacronycine (3) using NaBH4. Acylation of 3 afforded 12, 13, and 14. These esters (12, 13, and 14) were more potent than 1 when tested against L-1210 cells in vitro. Diacetate 12 was evaluated in vivo against murine P-388 leukemia and was markedly active at a dose 16-fold lower than acronycine itself.
moiety responsible for the activity of acronycine. This oxidation showed the sensitivity of the ethylenicbond, leading to the formation of the corresponding epoxides, diols and/or ketoalcohol. In the case of 5-dimethylamino-2,2-dimethylchromene 8, the doublebond was not sensitive to oxidation, but the N-methyl groups reacted to lead to the formamide derivative 16 and an imino-alcohol 17. This methodology
1-Oxo-2-hydroxy-1,2-dihydroacronycine: A Useful Synthon in the Acronycine Series for the Introduction of Amino Substituents at 6-Position and for the Conversion into Isoproplfuroacridones.
Thermic aromatic nucleophilicdisplacement of the methoxygroup at C-6 of (+/-)-1-oxo-2-hydroxy-1,2-dihydroacronycine (2) by an amine is a reaction that gives a facile entry to acronycine derivatives bearing an amino substituent at this position. The introduction of the amino substituents was confirmed with a long-range 1H-15N correlation NMR spectrum at natural abundance. Under basic conditions, compound