several pharmaceutically relevant monoterpenoid indole alkaloids. Optically pure C3-methyl-substituted strictosidine derivatives were prepared by setting up the two stereogenic centers at the β-carboline core via two enzymatic steps catalyzed by the enzymes transaminase and strictosidine synthase in a one-pot cascade fashion. The two enzymatic steps were performed simultaneously as well as in a stepwise
(S)-Strictosidine代表几种药物相关的单
萜类吲哚生物碱生物合成中的第一个关键中间体。通过一锅级联的方式,通过转
氨酶和丁糖核苷合酶催化的两个酶促步骤,在β-咔啉核心上建立两个立体异构中心,从而制备了光学纯的C3-甲基取代的丁糖苷衍
生物。这两个酶促步骤同时以及逐步进行。前手性酮的胺化产生光学纯的胺,其对映体过量高达> 98%。根据所用的酶,(S)-和(R在大多数情况下,制备对映体。然后将选定的
胺类与secologanin缩合,在严格的核苷合酶催化的Pictet-Spengler反应中缩合,生成非对映体纯产物(> 98%的非对映体过量)。