The first totalsyntheses of the novel 3,5,5,7-sesquiterpenoids (+)-Echinopine A (1) and B (2) were achieved. Thereby the proposed structures were confirmed, and the absolutestereochemistry was determined. The key features are (1) the stereoselective installation of the vinyl-moiety on the concave side of the bicyclo[3.3.0]octane core via Myers’ [3,3]-sigmatropic rearrangement, (2) the finding that
New β-amino alcohols with a bicyclo[3.3.0]octane scaffold in an asymmetric Henry reaction
作者:Yu-Wu Zhong、Ping Tian、Guo-Qiang Lin
DOI:10.1016/j.tetasy.2003.11.040
日期:2004.3
A new category of β-amino alcohols with a bicyclo[3.3.0]octane scaffold has been synthesized and used in the direct asymmetric nitroaldol reaction (Henry reaction). Up to 74% ee was obtained with the addition of nitromethane to relatively bulky aldehydes.
Structurally diverse bicyclo[3.3.0]octanes were prepared and tested for their biological activity. Both the antiproliferative activity and the results of phenotypic characterization varied with the substitution patterns. Two derivatives displayed high inhibitory (IC50 ⩽3 μM) activity against the L-929 cell line, but differed in their mode of action. A cluster analysis with impedance profiling data