an enatiopure form. Aziridine (2) was converted to 3, which was used for the synthesis of 4. Both the advanced key intermediates, vinylaziridines 3 and 4, were successfully converted to threo‐sphingosines 1a and 1b, respectively. Ring‐closing metathesis (RCM) using the Grubbs II catalyst was the key reaction in the synthesis. Two erythro‐sphingosines 1c and 1d were synthesized by the ring‐expansion reactions
从单一
中间体手性
氮丙啶(2)开始合成了
鞘氨醇的所有四个立体异构体,该
中间体通过酶促
脱对称化以对映体形式有效制备。
氮丙啶(2)转化为3,用于合成4。两种先进的关键
中间体乙烯基氮丙啶3和4分别成功地转化为苏式
鞘氨醇1a和1b。使用Grubbs II
催化剂进行的闭环复分解(RCM)是合成中的关键反应。两个赤型
鞘氨醇1c和1d通过
乙烯基氮丙啶3和4的扩环反应合成,然后进行RCM反应合成。成功的发散性合成证实,手性
乙烯基氮丙啶2可用作合成
鞘氨醇相关
天然产物的关键
中间体。