Regioselective synthesis of water-soluble monophosphate derivatives of combretastatin A-1.

ABSTRACT: The natural products combretastatin A-4 (CA4) and combretastatin A-1 (CA1) are potent cancer vascular disrupting agents and inhibitors of tubulin assembly (IC₅₀ = 1-2 μM). The phosphorylated prodrugs CA4P and CA1P are undergoing human clinical trials against cancer. CA1 is unique due to its incorporation of a vicinal phenol, which has afforded the opportunity to prepare both diphosphate and regioisomeric monophosphate derivatives. Here, we describe the first synthetic routes suitable for the regiospecific preparation of the CA1-monophosphates CA1MPA (8a/b) and CA1MPB (4a/b). The essential regiochemistry necessary to distinguish between the two vicinal phenolic groups was accomplished with a tosyl protecting group strategy. Each of the four monophosphate analogues (including Z and E isomers

SUBMITTER: Tanpure RP 

PROVIDER: S-EPMC3275140 | biostudies-literature | 2011 Jul

REPOSITORIES: biostudies-literature