A Divergent Enantioselective Synthesis of 9-J<sub>1</sub>-Phytoprostane and 9-A<sub>1</sub>-Phytoprostane Methyl Ester
作者:Alessio Porta、Francesco Chiesa、Marco Quaroni、Marco Persico、Remigio Moratti、Giuseppe Zanoni、Giovanni Vidari
DOI:10.1002/ejoc.201301703
日期:2014.4
The first syntheses of 9-J1-phytoprostane and 9-A1-phytoprostane methyl ester were achieved enantioselectively using a divergent approach from a common intermediate sulfone 4. The divergence was accomplished using a sigmatropic rearrangement (swap protocol) to give sulfone 5 in 47 % overall yield. The two upper side-chains, with a stereodefined E double bond, were installed using consolidated Julia–Lythgoe
9-J1-植物前列烷和 9-A1-植物前列烷甲酯的第一次合成是使用来自常见中间体砜 4 的发散方法对映选择性地实现的。使用 sigmatropic 重排(交换协议)完成发散,得到 47% 的砜 5总产量。带有立体定义的 E 双键的两个上侧链使用砜 4 和 5 的巩固 Julia-Lythgoe 烯化反应安装,具有相同的对映体纯 α-保护醛 6。