作者:Venkatesan Santhanam、Namakkal G. Ramesh
DOI:10.1002/ejoc.201402943
日期:2014.11
The synthesis of two new stereoisomers of steviamine, namely 1,8a-di-epi-(+)-steviamine and 2,3-di-epi-(–)-steviamine, is reported, starting from tri-O-benzyl-D-glucal. The key step in the synthesis was a modified Julia olefination of a 2-formyl-polyhydroxy-pyrrolidine with a sulfone derived from ethyl acetoacetate. Glycosidase-inhibition studies revealed that 2,3-di-epi-(–)-steviamine is a selective
据报道,从三-O-苄基-D开始合成两种新的甜菊胺立体异构体,即1,8a-二-表-(+)-甜菊胺和2,3-二-表-(-)-甜菊胺-葡萄糖。合成中的关键步骤是 2-甲酰基-多羟基-吡咯烷与来自乙酰乙酸乙酯的砜的改性 Julia 烯化。糖苷酶抑制研究表明,2,3-di-epi-(-)-steviamine 是 α-半乳糖苷酶的选择性抑制剂。