作者:Hermut Wehlan、Mario Dauber、M. Teresa Mujica Fernaud、Julia Schuppan、Sonja Keiper、Rainer Mahrwald、M.-Elisa Juarez Garcia、Ulrich Koert
DOI:10.1002/chem.200600462
日期:2006.9.25
The total synthesis of apoptolidin A is described employing an early glycosylation strategy. Strategic disconnections were chosen between C11-C12 (cross-coupling) and C19O-C1 (macrocyclization). The cis-selective glycosylation at C9-OH was achieved with the new SIBA protective group at O2/O3 of the L-glucose residue. Auxiliary substitutents at the 2-position of the 2-deoxy sugars were applied to form
使用早期糖基化策略描述了凋亡肽A的总合成。在C11-C12(交叉耦合)和C19O-C1(宏环化)之间选择了战略性断开连接。在L-葡萄糖残基的O2 / O3处通过新的SIBA保护基实现了C9-OH处的顺式选择性糖基化。施加2-脱氧糖的2-位的辅助取代基以选择性地形成C27二糖的糖苷键。用CuI-噻吩羧酸盐实现了糖基化的北半部分与糖基化的南半部分的交叉偶联。三羟基羧酸的大环化选择性地产生了20元大环内酯。H 2 SiF 6适合于甲硅烷基醚的最终脱保护和C 21甲基缩酮向半缩酮的转化。