作者:Sudhir M. Hande、Jun’ichi Uenishi
DOI:10.1016/j.tetlet.2008.10.115
日期:2009.1
Fourteen-membered cytotoxic macrolides 1 and 2 were synthesized from alcohol 10 in 15 steps utilizing stereospecific Pd(II)-catalyzed cyclization of ζ-hydroxy chiral allylic alcohol 7. Aspergillides A and B were isolated from marine fungus, and their structures were proposed as 1 and 2, respectively. The synthetic 1 was not matched with aspergillide A but matched with aspergillide B. The chiral center
利用立体定向Pd(II)催化ζ-羟基手性烯丙基醇7的环化反应,由醇10在15个步骤中合成了14元细胞毒性大环内酯1和2。从海洋真菌中分离出曲霉内酯A和B,其结构分别为1和2。合成物1不与曲霉内酯A匹配,但与曲霉内酯B匹配。将曲霉内酯B的C-13位置的手性中心修改为(S)-配置。立体选择性合成的关键步骤包括Sharpless不对称二羟基化,交叉复分解,使用Pd II催化剂对16的四氢吡喃环进行立体定向构型以及Yamaguchi大内酯化。