作者:Johann Mulzer、Andreas Mantoulidis、Elisabeth Öhler
DOI:10.1021/jo0007480
日期:2000.11.1
described, starting from optically pure (S)-malic acid and methyl (R)-3-hydroxy-2-methylpropionate. The synthesis is highly convergent by coupling the three fragments C1-C6 (fragment D), C7-C10 (fragment C), and C11-C21 (fragment B). Key steps are two stereoselective Wittig type olefinations to generate the 12,13- and 16,17-double bonds, an enantioselective Mukaiyama aldol addition to synthesize fragment
从光学纯的(S)-苹果酸和(R)-3-羟基-2-甲基丙酸甲酯开始,描述了微管稳定的抗肿瘤药物埃博霉素B和D的总合成。通过偶联三个片段C1-C6(片段D),C7-C10(片段C)和C11-C21(片段B),合成高度收敛。关键步骤是两个立体选择性Wittig型烯烃生成12,13-和16,17-双键,对映选择性Mukaiyama aldol加成以合成片段D,以及砜阴离子烯丙基碘烷基化以连接片段B和C。最后是片段D通过羟醛加成连接到B + C片段。