作者:Stephen Hanessian、Thilo Focken、Xueling Mi、Rupal Oza、Bin Chen、Dougal Ritson、Renaud Beaudegnies
DOI:10.1021/jo100956v
日期:2010.8.20
An enantioselective synthesis of the antifungal natural product (+)-ambruticin S has been accomplished starting with the readily available methyl α-d-glucopyranoside, (R)-Roche ester, and (S)-glycidol as chirons, which encompassed seven of the 10 stereogenic centers of the target molecule. The remaining three centers were set by a highly diastereoselective, asymmetric cyclopropanation employing a chiral
从容易获得的甲基α- d-吡喃葡萄糖苷,(R)-罗氏酯和(S)-缩水甘油为chirons的化合物开始,完成了抗真菌天然产物(+)-ambruticin S的对映选择性合成。靶分子的10个立体定位中心。其余三个中心是通过采用非手性非外消旋膦酰胺试剂进行高度非对映选择性,不对称环丙烷化而确定的。我们对二氢亚基建设战略包括高顺式-选择性路易斯酸催化6-内- TRIG环化。合成过程中的其他关键步骤包括用二噻吩阴离子进行环氧化物开环,两次有效的基于膦酰胺-阴离子的烯烃化反应以及后期的C-糖基化反应。