Wang, H. S., Usui, T., Osada, H. and Ganesan, A.
Synthesis and evaluation of tryprostatin B and demethoxyfumitremorgin C analogues
Journal of Medicinal Chemistry, 43, (8), . (doi:10.1021/jm9905662).
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Tryprostatin B and demethoxyfumitremorgin C are fungal inhibitors of mammalian cell cycle progression at the G(2)/M transition. N-Alkyl derivatives of the L-TrP-L-Pro diketopiperazine were prepared as analogues of tryprostatin B, and two of these were more active than the natural product. A second series of cis- and trans-tetrahydro-beta-carbolines annulated to a diketopiperazine were prepared as analogues of demethoxyfumitremorgin C. The nature of the alkyl substituent, as well as its cis or trans relationship in the tetrahydro-beta-carboline ring, was found to have a significant effect on cytotoxic activity. Small cis-alkyl substituents fall into the demethoxyfumitremorgin C family, whereas bulky benzyl trans compounds appear to act via a different mechanism of action.
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