Total synthesis and conformational studies of ceratospongamide, a bioactive cyclic heptapeptide from marine origin
作者:Fumiaki Yokokawa、Hirofumi Sameshima、Yasuko In、Katsuhiko Minoura、Toshimasa Ishida、Takayuki Shioiri
DOI:10.1016/s0040-4020(02)00906-7
日期:2002.9
The first total synthesis of cis,cis-ceratospongamide (cyclo[l-Pro-l-Ile-Me-oxazoline-l-Phe-l-Pro-thiazole-l-Phe-]) was accomplished and confirmed by X-ray crystal analysis. The heating of cis,cis-ceratospongamide in DMSO converted it not to the trans,trans isomer but to the trans,trans-[d-allo-Ile]-ceratospongamide, which was confirmed by total synthesis. Its solution conformation was constructed
X射线晶体证实了顺式,顺式-ceratospongamide(环[1-Pro-Ile-Me-恶唑啉-1-Phe-1-Pro-噻唑-1-Phe-])的第一个全合成反应。分析。DMSO中顺式,顺式-ceratospongamide的加热将其转化为反式,反式异构体,而不是反式,反式-[d-allo-Ile] -ceratospongamide,这已通过全合成得到证实。它的溶液构象是利用ROE交叉峰通过动态模拟退火方法构建的,显示出一个圆扁的环结构,与顺式,顺式的细长结构紧密形成对比。异构体。结果表明,反式,反式-[d-allo-Ile]异构体是顺式,顺式-ceratospongamide的主要热产物。