The efficient asymmetric preparation of the C2-symmetric chiral 1,4-diamine, (1R,2S,4R,5S)-1,4-diamino-2,5-dimethylcyclohexane (5), and its salen ligands is described. With the Mitsunobu reaction as the key step, the overall yield of the four-step synthesis of 5 is 45%. The enantioselective alkynylation of meso- epoxides catalyzed by chiral gallium complexes is also achieved.
本文介绍了 C2 对称手性 1,4 二胺 (1R,2S,4R,5S)-1,4-二
氨基-2,5-二
甲基环己烷 (5) 及其沙仑
配体的高效不对称制备方法。以 Mitsunobu 反应为关键步骤,四步合成 5 的总收率为 45%。此外,还实现了手性
镓络合物催化的中
环氧化物的对映选择性炔化反应。