GABA agonists. Resolution, absolute stereochemistry and enantioselectivity of (S)-(+)- and (R)-(-)-dihydromuscimol
作者:Povl Krogsgaard-Larsen、Lone Nielsen、Erik Falch、David R. Curtis
DOI:10.1021/jm00149a012
日期:1985.11
the inhibition of GABA uptake by DHM proved to reside exclusively in the (R)-(-) enantiomer (5). The affinity of 5 for BMC-sensitive GABA receptor sites in vitro was some 50 times lower than that of 4. Compounds 4 and 5 can be considered semirigid isosteres of the conformationally flexible GABA analogues (S)-(+)- and (R)-(-)-GABOB, respectively, which show a very low degree of enantioselectivity with
(RS)-5-(氨基甲基)-2-异恶唑啉-3-醇(二氢muscimol,DHM)是一种有效的4-氨基丁酸(GABA)激动剂,对神经元的抑制作用对拮抗性双小分子甲氯化物(BMC)敏感),并且它还在体外与GABA吸收系统相互作用。(S)-(+)-DHM(4)和(R)-(-)-DHM(5)使用辛可尼定作为唯一拆分剂,通过叔丁氧羰基保护的DHM(1)的拆分,以光学纯净形式获得。 。4和5的光学纯度和绝对立体化学是通过与3-羟基-4-氨基丁酸(GABOB)的(S)-(+)对映异构体进行化学相关性确定的。虽然4是体内和体外对BMC敏感且特异性强的GABA激动剂,但迄今为止可能是最有效的GABA激动剂,DHM对GABA吸收的抑制作用仅存在于(R)-(-)对映异构体中(5)。5在体外对BMC敏感的GABA受体位点的亲和力比4低50倍。化合物4和5可以被视为构象灵活的GABA类似物(S)-(+)-和(R)的半刚性等位基因。