Selective Inhibitors of Glial GABA Uptake: Synthesis, Absolute Stereochemistry, and Pharmacology of the Enantiomers of 3-Hydroxy-4-amino-4,5,6,7-tetrahydro-1,2-benzisoxazole (<i>exo</i>-THPO) and Analogues
作者:Erik Falch、Jens Perregaard、Bente Frølund、Birgitte Søkilde、Anders Buur、Lene M. Hansen、Karla Frydenvang、Lotte Brehm、Tina Bolvig、Orla M. Larsson、Connie Sanchez、Harold S. White、Arne Schousboe、Povl Krogsgaard-Larsen
DOI:10.1021/jm9904452
日期:1999.12.1
was more pronounced for 9, which showed IC(50) values of 40 and 500 microM as an inhibitor of glial and neuronal GABA uptake, respectively. These effects of 8 and 9 proved to be enantioselective, (R)-(-)-8 and (R)-(+)-9 being the active inhibitors of both uptake systems. The selectivity of 9 as a glial GABA uptake inhibitor was largely lost by replacing the N-methyl group of 9 by an ethyl group, compound
3-甲氧基-4,5,6,7-四氢-1,2-苯并恶唑-4-酮(20a)或相应的3-乙氧基类似物(20b)和3-氯-4,5,6,7 -四氢-1,2-苯并噻唑-4(51)是通过区域选择性铬酸氧化相应的双环四氢苯(19a,b和50)合成的,它们用作合成目标两性离子3-异恶唑的关键中间体8-15和3-异噻唑16和17。这些反应序列涉及不同的还原过程。鉴于(RS)-4-氨基-3-羟基-4,5,6,7-四氢-1,2-苯并恶唑(8,exo-THPO)是通过肟22a或22b的铝汞齐还原合成的,化合物9通过还原胺化获得11-13和15-17。通过N-Boc保护的伯胺25的N-乙基化合成化合物10。通过由伯胺23b和(R)-α-甲氧基苯基乙酰氯合成并随后通过制备型HPLC分离的非对映酰胺32和33,以高对映体纯度(ee≥99.1%)获得8的对映体。由仲胺27类似地制备9的对映异构体。基于X射线晶体学分析,肟22a的构型显示为E,(-)-8