Lipase-catalyzed kinetic resolution of tetronic acid derivatives bearing a chiral quaternary carbon: total synthesis of (S)-(−)-vertinolide
作者:Tetsuo Tauchi、Hiroki Sakuma、Takahiro Ohno、Nobuyuki Mase、Hidemi Yoda、Kunihiko Takabe
DOI:10.1016/j.tetasy.2006.07.044
日期:2006.9
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。