作者:Hiroyuki Nemoto、Kouichi Tanimoto、Yukiko Kanao、Sohei Omura、Yasuyuki Kita、Shuji Akai
DOI:10.1016/j.tet.2012.06.095
日期:2012.9
The protecting-group-free asymmetric total synthesis of (−)-rosmarinecine was achieved in only four steps from the commercially available (±)-3-hydroxypyrrolidine hydrochloride (2a). The key steps include the direct oxidation of (±)-2a to (±)-3-hydroxy-1-pyrroline N-oxide (1a) using the Davis reagent and the domino reaction; viz., the lipase-catalyzed dynamic kinetic resolution of (±)-1a with 1-ethoxyvinyl
从市售的(±)-3-羟基吡咯烷盐酸盐(2a)仅用四个步骤即可完成(-)-迷迭香碱的无保护基团的不对称全合成。的关键步骤包括(±)直接氧化-图2a至(±)-3-羟基-1-吡咯啉Ñ氧化物(1A使用戴维斯试剂和多米诺反应); 即,(±)脂肪酶催化的动态动力学拆分- 1A与乙氧基乙烯基1乙基马来酸,随后分子内[3 + 2]所生成的光学活性酯的偶极环加成反应。还获得了一些在酶促过程中观察到的旋光1a外消旋机理的见解。