作者:Karl-Heinz Altmann、Frédéric Cachoux、Franck Schaal、Antje Teichert、Trixie Wagner
DOI:10.1055/s-2004-835665
日期:——
An efficient synthesis of epothilone D analogs of type 1 has been developed, which is based on a highly diastereoselective Evans aldol reaction as one of the key steps. A profound difference in the relative stabilities of TBS-protecting groups on C7-O and C15-O was observed between secondary and primary amide groups at C5-N4. Although modeling studies had suggested analogs of type 1 to assume a conformation similar to the NMR-derived conformation of tubulin-bound epothilone A, compounds 1a-d were found to be significantly less active than the parent compound epothilone D.
高效合成1型埃博霉素D类似物的方法已被开发出来,其中关键步骤之一是高度立体选择性的Evans aldol反应。在C5-N4位上,次级和初级酰胺基团之间,C7-O和C15-O上的TBS保护基团的相对稳定性存在显著差异。尽管建模研究表明,1型类似物采取的构象类似于NMR衍生出的与微管结合的埃博霉素A的构象,但化合物1a-d的活性明显低于母体化合物埃博霉素D。