Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5516635 | Steroids | 2017 | 8 Pages |
â¢Synthesis novel chiral heterocycle-fused steroids based on [8Ï + 2Ï] cycloadditions.â¢Biological evaluation of a new family of hexacyclic steroids as anti-cancer agents.â¢Conclusions regarding structure-activity relationships could be withdrawn.â¢A benzyl group at C24 is important to ensure cytotoxicity against EL4.
Regio- and stereoselective synthesis of novel chiral 4,5,6,7-tetrahydropyrazolo[1,5-a]pyridine-fused steroids via [8ÏÂ +Â 2Ï] cycloaddition of diazafulvenium methides with steroidal scaffolds is reported. The biological evaluation of the new family of hexacyclic steroids as anti-cancer agents was also carried out. Hexacyclic steroids bearing a benzyl group at C-22, derived from 16-dehydropregnenolone and 16-dehydroprogesterone, show considerable cytotoxicity against EL4 (murine T-lymphoma) in contrast with the corresponding C-22-unsubstituted derivatives showing low cytotoxicity. Thus, results indicate that the presence of the benzyl group is important to ensure cytotoxicity.
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