Aflastatin A (1) is a specific inhibitor of aflatoxinproduction by Aspergillusparasiticus. It has the novel structure of a tetramic acid derivative with a long alkyl side chain. The absolute configurations of 29 chiral centers contained in 1 were chemically elucidated in this study. First, four small fragment molecules were prepared from 1 or its methyl ether (2), and their absolute structures were
Synthesis and Confirmation of the Absolute Stereochemistry of the (−)-Aflastatin A C<sub>9</sub>−C<sub>27</sub> Degradation Polyol
作者:David A. Evans、William C. Trenkle、Jing Zhang、Jason D. Burch
DOI:10.1021/ol051225n
日期:2005.7.1
A fragments were synthesized and coupled using a diastereoselective anti aldol reaction. This adduct was successfully converted into the C(9)-C(27) polyol degradation product of (-)-aflastatin A to confirm the relative and absolute stereochemistry of this region of the natural product.
structures, are specific inhibitors of aflatoxin production by Aspergillus parasiticus. The stereochemistry of the polyol fragment of 1 (3a) containing ten chiral centers was elucidated by applying acetonide and MTPA methods to a variety of acetonide derivatives of 3a, which determined the absoluteconfiguration of 3a. By using the similar methods, the absoluteconfiguration of the polyol fragment of 2 (4a)