361201-97-0Relevant articles and documents
Syntheses of 5a′-homo-vinblastine and congeners designed to establish structural determinants for isolation of atropisomers
Kuehne,Cowen,Xu,Borman
, p. 5303 - 5316 (2007/10/03)
The syntheses of 5a′-homo-vinblastine (3a) and its C-20′ methyl congener 62a were achieved. In contrast to vinblastine, these compounds did not allow isolation of atropisomers because of their lower conformational inversion barrier. However, annelation of a six-membered ring to the conformationally mobile D′-piperidine ring provided an isolated atropisomer 81a, which could be converted to its lower energy conformation 65a on heating. The 5a′-homo-vinblastine congeners 3a, 62a, and 65a showed vinblastine-like inhibition of tubulin polymerization and cytotoxicity to L1210 leukemia cells, albeit at lower potency for the latter activity, than that found with the corresponding compounds in the vinblastine series.