Absolute Configuration of Aflastatin A, a Specific Inhibitor of Aflatoxin Production by <i>Aspergillus </i><i>p</i><i>arasiticus</i>
作者:Hiroyuki Ikeda、Nobuaki Matsumori、Makoto Ono、Akinori Suzuki、Akira Isogai、Hiromichi Nagasawa、Shohei Sakuda
DOI:10.1021/jo991284c
日期:2000.1.1
Aflastatin A (1) is a specific inhibitor of aflatoxin production by Aspergillus parasiticus. 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
Aflastatin A(1)是一种由寄生曲霉产生的黄曲霉毒素的特异性抑制剂。它具有带有长烷基侧链的四酸衍生物的新型结构。在这项研究中化学阐明了1个化合物中29个手性中心的绝对构型。首先,从1或其甲基醚(2)制备四个小片段分子,并将它们的绝对结构分配为N-甲基-D-丙氨酸,(2S,4R)-2、4-二甲基-1,6-己二醇二苯甲酸酯,(R)-3-羟基十二烷酸和(R)-1,1,2,4-丁三醇三苯甲酸酯。接下来,通过NaIO(4)氧化从1中获得具有13个手性中心的无环片段分子3,并通过基于J的构型分析阐明了其相对立体化学。通过分析(3)J(H,H)和(2,3)J(C,H)的耦合常数以及ROE数据,验证了3的相对构型。最后,通过进一步的基于J的构型分析,使用由2个具有28个手性碳的片段分子7,澄清了1个烷基侧链中的所有相对构型。通过将这些相对构型与前四个片段分子的绝对构型联系起来,可以完全确定1的绝对立体化学。