Absolute Configuration and Pharmacology of the Poison Frog Alkaloid Phantasmidine
作者:Richard W. Fitch、Barry B. Snider、Quan Zhou、Bruce M. Foxman、Anshul A. Pandya、Jerrel L. Yakel、Thao T. Olson、Nour Al-Muhtasib、Yingxian Xiao、Kevin D. Welch、Kip E. Panter
DOI:10.1021/acs.jnatprod.8b00062
日期:2018.4.27
Phantasmidine, a rigid congener of the well-known nicotinic acetylcholine receptor agonist epibatidine, is found in the same species of poison frog (Epipedobates anthonyi). Natural phantasmidine was found to be a 4:1 scalemic mixture, enriched in the (2aR,4aS,9aS) enantiomer by chiral-phase LC-MS comparison to the synthetic enantiomers whose absolute configurations were previously established by Mosher’s
在相同种类的毒蛙(Epipedobates anthonyi)中发现了Phantasmidine,它是众所周知的烟碱型乙酰胆碱受体激动剂Epibatidine的刚性同类物。通过手性液相色谱-质谱法与天然对映异构体进行比较,发现天然的潘他ta啶是一种4:1的比例混合物,富含(2a R,4a S,9a S)对映异构体,而合成对映异构体的绝对构型先前是通过Mosher酰胺分析确定的。主要对映异构体在苄基碳上具有与天然表巴替丁相反的S构型,后者的苄基碳为R。合成外消旋体和分离的对映异构体的药理学特征表明,在大多数测试的受体中,比他命啶的效价比表巴替丁低约10倍,但比尼古丁强约100倍。与Epibatidine不同,Pantatasmidine在活性上具有很强的对映选择性,而苄基碳原子具有4a S构型的主要天然对映体则更具活性。与以前对于Epibatidine对映异构体建议的几乎对称构象相比,pha