Synthesis, Separation, and Theoretical Studies of Chiral Biphenyl Lignans (- and -DDB)
作者:Junbiao Chang、Rongfeng Chen、Ruiyun Guo、Chunhong Dong、Kang Zhao
DOI:10.1002/hlca.200390180
日期:2003.6
Two biphenyl lignans, α- and β-DDB (1 and 2, respectively) were efficiently synthesized without contamination by other regio-isomers. The different yields of the Ullmann coupling reactions for the synthesis of 1 and 2 were rationalized by calculating steric hindrance, stability, entropy change, and heat-of-formation values. The enantiomers of 1 and 2 were readily separated by HPLC on a chiral stationary
有效地合成了两个联苯木脂素α-和β- DDB(分别为1和2),而没有受到其他区域异构体的污染。通过计算位阻,稳定性,熵变和形成热值,可以合理地合成用于1和2合成的Ullmann偶联反应的不同收率。1和2的对映体很容易通过HPLC在手性固定相上分离。根据真实天然产品的棉花效果分配其配置。