Synthesis and evaluation of backbone/amide-modified analogs of leualacin
摘要:
Leualacin (1), a cyclic depsi-pentapeptide, and its backbone/amide-modified analogs 2-4 were synthesized. Amide analogue 3 exhibited stronger vasodilatory effects. It also strongly inhibited collagen- and arachidonic acid (AA)induced platelet aggregations with IC(50)s of 0.6 mu M and 2.0 mu M, respectively (C) 1999 Elsevier Science Ltd. All rights reserved.
Total Synthesis of the Cyclic Depsipeptide Leualacin
摘要:
The fungal metabolite leualacin (1), a potent calcium channel antagonist, was synthesized in 15 steps from commercially available amino acids in 25% overall yield using standard solution methods. The synthesis is general and thus would accommodate the incorporation of amino acid replacements as well as the inclusion of peptide mimics and isosteres.
Synthesis and biological evaluation of novel cryptophycin analogs with modification in the β-alanine region
作者:Chuan Shih、Lynn S. Gossett、Joseph M. Gruber、C.Sue Grossman、Sherri L. Andis、Richard M. Schultz、John F. Worzalla、Tom H. Corbett、James T. Metz
DOI:10.1016/s0960-894x(98)00682-9
日期:1999.1
Structure modification of the beta-alanine region (fragment C) of the potent antimitotic agent cryptophycin was investigated. This includes: (1) introduction of substituents at the previously unsubstituted C7 position of the macrolide ring and (:2) replacement of the (2R)-3-amino-2-methyl-propanoic acid (beta-alanine) with various (1)-amino acids to give the corresponding 15-membered unnatural cryptophycin analogs. (C) 1998 Elsevier Science Ltd. All rights reserved.