Seven main metabolites (3-9) of afloqualone (1, 6-amino-2-fluoromethyl-3-(o-tolyl)-4 (3H)-quinazolinone and related 4 (3H)-quinazolinone derivatives were synthesized. The metabolites 4 and 5 containing a sulfur atom were prepared by the reaction of 6-acetamido-2-chloromethyl-3-(o-tolyl)-4 (3H)-quinazolinone (11) with NaSCH3 followed by oxidation with H2O2. Reaction of 11 and N-acetyl-L-cysteine gave the mercapturic acid-conjugated metabolite 6. Condensation of 2-fluoroacetamido-5-nitrobenzoic acid (19) and 2-amino-benzyl alcohol (20) with dicyclohexylcarbodiimide (DCC) in the presence of 1-hydroxy-benzotriazole afforded 2-fluoromethyl-3-(o-hydroxymethylphenyl)-6-nitro-4 (3H)-quinazolinone (21), which was converted to the metabolites 7 and 8. Treatment of the 2-bromomethyl-4 (3H)-quinazolinone (24) with AgBF4-H2O in dimethylsulfoxide (DMSO) gave the 2-hydroxymethyl metabolite 9. None of the main metabolites (2-9) showed significant central nervous system depressant activity.
七种主要代谢物(3-9号),如afloqualone(1号,6-
氨基-2-
氟甲基-3-(邻
甲苯基)-4(3H)-
喹唑啉酮)及相关4(3H)-
喹唑啉酮衍
生物,已被合成。带有
硫原子的代谢物4和5是通过6-乙酰
氨基-2-
氯甲基-3-(邻
甲苯基)-4(3H)-
喹唑啉酮(11号)与NaSCH3反应,随后用
H2O2氧化制备的。11号化合物与
N-乙酰-L-半胱氨酸反应得到
硫醇
尿酸结合型代谢物6号。在
1-羟基苯并三唑存在下,通过2-
氟乙酰氨基-5-硝基
苯甲酸(19号)与2-
氨基
苄醇(20号)与二环己基碳二
亚胺(
DCC)缩合,获得2-
氟甲基-3-(邻羟甲基苯基)-6-硝基-4(3H)-
喹唑啉酮(21号),进而转化为代谢物7号和8号。2-
溴甲基-4(3H)-
喹唑啉酮(24号)在
二甲基亚砜(
DMSO)中与
AgBF4-
H2O反应得到2-羟甲基代谢物9号。主要代谢物(2-9号)均未显示出显著的神经系统抑制活性。