Rational Design of Azastatin as a Potential ADC Payload with Reduced Bystander Killing
作者:Rafael W. Hartmann、Raphael Fahrner、Denys Shevshenko、Mårten Fyrknäs、Rolf Larsson、Fredrik Lehmann、Luke R. Odell
DOI:10.1002/cmdc.202000497
日期:2020.12.15
side chain amine for antibody conjugation. The synthesis of Cbz‐azastatin methyl ester, which included the C2‐elongation and diastereoselective reduction of two proteinogenic aminoacids as key transformations, was accomplished in 22 steps and 0.76 % overall yield. While Cbz‐protected azastatin methyl ester (0.13–3.0 nM) inhibited proliferation more potently than MMAE (0.47–6.5 nM), removal of the Cbz‐group
作者:George R. Pettit、Sheo Bux Singh、Jayaram K. Srirangam、Fiona Hogan-Pierson、Michael D. Williams
DOI:10.1021/jo00086a034
日期:1994.4
The synthesis of dolaisoleuine as its tert-butyl ester (Dil-OBu(t)), a beta-methoxy-gamma-amino acid component of dolastatin 10, has been achieved employing as key step an aldol condensation between N-(benzyloxycarbonyl)-N-methyl-(S,S)-isoleucinal and tert-butyl acetate followed by O-methylation. The overall six-step reaction sequence to Dil proved to be convenient for routine preparation of this new amino acid and its stereochemical assignment as (3R,4S,SS)-N,O-dimethylisostatine.
Synthesis and Antitumor Activity of Novel Dolastatin 10 Analogs.
Dolastatin 10 (1) is a potent antineoplastic pentapeptide. Novel dolastatin 10 analogs each modified at one of the constituent amino acid derivatives, were synthesized and their antitumoractivity was evaluated against P388 leukemia in mice. The structuralrequirements for antitumoractivity are discussed. Some of the analogs, 31c, 35c, 38b, and 50c showed excellent activity in vivo. Highly active 50c