Mark A Rizzacasa

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Three new neoclerodane diterpenoids, salvinorins D-F (4-6), have been isolated from the leaves of Salvia divinorum. The structures were elucidated by chemical and spectroscopic methods, particularly 1D and 2D NMR. A simplified isolation method using chromatography on activated carbon also gave improved yields of the controlled substance salvinorin A (1) and(More)
There is significant interest in treating cancers by blocking protein synthesis, to which hematological malignancies seem particularly sensitive. The translation elongation inhibitor homoharringtonine (Omacetaxine mepesuccinate) is undergoing clinical trials for chronic myeloid leukemia, whereas the translation initiation inhibitor silvestrol has shown(More)
The total synthesis of the endogenous inflammation resolving eicosanoid resolvin D2 (1) is described. The key steps involved a Wittig reaction between aldehyde 5 and the ylide derived from phosphonium salt 6 to give enyne 17 and condensation of the same ylide with aldehyde 7 to afford enyne 11. Desilylation of 11 followed by hydrozirconation and iodination(More)
The total synthesis of natural (+)-trachyspic acid and its enantiomer is described starting from a common 2-deoxy-d-ribose derivative. The synthesis of the corresponding C3 epimers from the same starting material is also described. Each stereoisomer was assayed for heparanase inhibition.
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