Synthesis and Biological Activities of the 3,5-Disubstituted Indolizidine Poison Frog Alkaloid 239Q and Its Congeners
作者:Xu Wang、Hiroshi Tsuneki、Noriko Urata、Yasuhiro Tezuka、Tsutomu Wada、Toshiyasu Sasaoka、Hideki Sakai、Ralph A. Saporito、Naoki Toyooka
DOI:10.1002/ejoc.201200974
日期:2012.12
The first total synthesis of the 3,5-disubstituted indolizidine toad alkaloid 239Q from the known pyrrolidine 1 has been achieved, in seven steps with a 35 % overall yield. The relative stereochemistry of natural 239Q was determined unambiguously by comparison of GC-FTIR spectra of synthetic material with the skin extracts of the toad Melanophryniscus cupreuscapularis. The C7 congeners at the 5-position
从已知的吡咯烷 1 中首次全合成 3,5-二取代吲哚里西啶蟾生物碱 239Q,分七个步骤,总产率为 35%。通过比较合成材料与蟾蜍 Melanophryniscus cupreuscapularis 的皮肤提取物的 GC-FTIR 光谱,可以明确确定天然 239Q 的相对立体化学。5 位(12 和 13)的 C7 同源物对 α4β2 烟碱型乙酰胆碱受体显示出强烈的拮抗活性。