mumol/kg) was more potent than 2a (220 mumol/kg) as a convulsant after subcutaneous administration in mice. The protolytic properties of 2a,b-4a,b were determined using 13C NMR spectroscopy. For each pair of compounds, the alpha-amino acid groups showed similar protolytic properties, whereas the 3-isoxazolol moieties typically showed pKa values 2 units lower than those of the 3-isothiazolols. Accordingly
谷
氨酸的许多3-
异噻唑醇
生物等排体(1)和
AMPA受体激动剂的类似物(RS)-2-
氨基-3-(3-羟基-
5-甲基异恶唑-4-基)
丙酸(
AMPA,2a ),其中包括(RS)-2-
氨基-3-(3-羟基-5-甲基
异噻唑-4-基)
丙酸(thio-
AMPA,2b)。使用一系列受体结合测定(IC50值)和电生理大鼠皮层切片模型(
EC50值),对该系列3-isothiazolol和相应的3-isoxazolol
氨基酸进行了体外比较药理研究。而2a(IC50 = 0.04 +/- 0.005 microM,
EC50 = 3.5 +/- 0.2 microM)明显比叔丁基类似物
ATPA(3a)更有效(IC50 = 2.1 +/- 0.16 microM,
EC50 = 34 + / -[3H]
AMPA结合和电生理研究中的2.4 microM),2b(IC50 = 1.8 +/- 0.13 microM,
EC50