Synthesis and characterization of all four isomers of the muscarinic agonist, 2'-methylspiro[1-azabicyclo[2.2.2]octane-3,4'-[1,3]dioxolane]
作者:John Saunders、Graham A. Showell、Raymond Baker、Stephen B. Freedman、David Hill、Alexander McKnight、Nigel Newberry、John D. Salamone、Jordan Hirshfield、James P. Springer
DOI:10.1021/jm00389a003
日期:1987.6
previously known as AF30, have been synthesized by a route that has allowed the absolute stereochemistry of each isomer to be assigned. With the chirality of (-)-camphanic acid known, X-ray analysis of the more crystalline intermediate diastereomeric camphanate 5A allowed the absolute stereochemistry at the quinuclidine chiral center to be determined. Each diastereomer was separately transformed into the spirodioxolane
毒蕈碱激动剂1的四个分离的异构体(以前称为AF30)通过允许分配每种异构体的绝对立体化学的途径合成。在已知(-)-樟脑酸的手性的情况下,对更具结晶性的中间体非对映体樟脑酸酯5A进行X射线分析,可以确定喹核苷手性中心的绝对立体化学。在引入第二个手性中心的同时,将每种非对映异构体分别转化为螺二氧戊环。进行色谱分离,然后进行第二次晶体结构测定,揭示了1的所有四个异构体的绝对立体化学。每种异构体的详细生物学评估表明,尽管3(R),2'(S)异构体在结合研究中最活跃,但它是3(R),2' (R)异构体在神经节(M-1位)和心脏(M-2位)之间显示出最大的功能选择性。在相同的手性内标下,活性更高的对映异构体3的绝对构型显示为S,证实了较早的文献报道。