240428-83-5Relevant articles and documents
Novel cryptophycin antitumor agents: Synthesis and cytotoxicity of fragment 'B' analogues
Patel, Vinod F.,Andis, Sherri L.,Kennedy, Joseph H.,Ray, James E.,Schultz, Richard M.
, p. 2588 - 2603 (2007/10/03)
A general synthetic approach to novel cryptophycin analogues 6 is described. N-Hydroxysuccinimide active ester 15, a key common intermediate, was converted to β-epoxide 6 in three steps, via initial coupling with unprotected amino acid 9, followed by deprotection/macrolactamization of acyclic precursor 16, and final oxidation of styrene 7 to install the C7-C8 β-epoxide. Cryptophycin styrenes 7 and β-epoxides 6, bearing diverse side chains in fragment 'B', were evaluated for cytotoxic activity, β-Epoxides 6, in general, were significantly more potent than the corresponding α-epoxides 17 and styrenes 7. A benzyl side chain was required for potent activity, with β-epoxide 6u, possessing a 3-Cl,4-(dimethylamino)benzyl moiety, as the most potent cytotoxic agent prepared, with an IC50 = 54 pM, only 2-fold-less than that of Cryptophycin-52 (3).