We have developed a chemoenzymatic synthesis of (S)-vertinolide 1 with a chiral quaternary carbon atom at C5. In the kinetic resolution of tetronic acid precursor 6, lipase PS-D furnished the recovered alcohol 6 with an (R)-stereochemistry in a ratio of 95% ee, whereas lipase AY gave (S)-alcohol 6 with 93% ee. Chemical transformations of (S)-alcohol 6 provided (S)-vertinolide 1 in 33% yield in five
我们开发了一种
化学酶促合成的(S)-vertinolide 1,在C5处具有手性季碳原子。在tetronic酸前体6的动力学拆分中,
脂肪酶PS-D为回收的醇6提供了(R)-立体
化学,比率为95%ee,而
脂肪酶AY提供了具有93%ee的(S)-醇6。(S)-醇6的
化学转化在五个步骤中以33%的收率提供了(S)-vertinolide 1,而没有对映体过量的损失。