Synthesis and Sedative-Hypnotic Effects of N3-Allyl- and N1-Allyl-5,6-substituted 2-Thiouracil Derivatives in Mice.
作者:Marcin DRAMINSKI、Krzysztof TURSKI、Yuji TATEOKA、Toshiyuki KIMURA、Kazuhito WATANABE、Shigemi KONDO、Ing Kang HO、Ikuo YAMAMOTO
DOI:10.1248/cpb.46.1370
日期:——
Twenty four thiouracil derivatives, including N3-allyl- (19) and N1-allyl-2-thiouracil (20) were synthesized and their pharmacological effects [sedative-hypnotic activity (loss of righting reflex and spontaneous activity), convulsant activity, effect on pentobarbital (PB)-induced sleep and mortality] were evaluated in mice at doses of 320 mg/kg, i.p. and 2 μmol/mouse by intracerebroventricular (i.c.v.) injections, respectively. N3-Allyl-6-propyl-2-thiouracil (3), N3-allyl-5, 6-dimethyl-2-thiouracil (10), N3-allyl-1, 2, 3, 4, 5, 6, 7, 8, 9-nonahydro-4-oxo-2-thiocyclohepta[d]pyrimidine (16) and N3-allyl-5-methyl-2-thiouracil (18) exhibited sedative-hypnotic activity, whereas N3-allyl-6-ethyl-5-methyl-2-thiouracil (11), N1-allyl-5-methyl-2-thiouracil (21), N1-allyl-1, 2, 3, 4, 5, 6, 7, 8, 9-nonahydro-4-oxo-2-thiocyclohepta[d]pyrimidine (23) and N1-allyl-5, 6-dimethyl-2-thiouracil (24) conversely displayed clonic- and/or tonic-convulsant seizures. N3-Allyl-6-propyl-2-thiouracil (3) and N3-allyl-5-methyl-2-thiouracil (18) decreased spontaneous activity. Other compounds examined were inactive, or only slightly active in the sedative-hypnotic assay even at high doses. Fifteen compounds (1-4, 7, 10, 11, 14-16, 18-21, and 23) significantly prolonged the PB-induced sleeping time. Interestingly, only N1-allyl-5, 6-dimethyl-2-thiouracil (24) shortened the PB-induced sleeping time. These results showed that these thiouracils possessed many different effects such as sedative-hypnotic, anticonvulsant and/or convulsant, and that N3-allyl-5-methly-2-thiouracil (18) and N1-allyl-5, 6-dimethyl-2-thiouracil (24) had the most potent hypnotic activity and antagonistic effect against PB, respectively.
合成了 24 种硫脲嘧啶衍生物,包括 N3-allyl- (19) 和 N1-allyl-2-thiouracil (20),并分别以 320 毫克/千克和 2 微摩尔/只小鼠的剂量在小鼠体内进行脑静脉注射,评估了它们的药理作用[镇静催眠活性(丧失直立反射和自发活动)、惊厥活性、对戊巴比妥(PB)诱导的睡眠和死亡率的影响]。p.和 2 μmol/只小鼠进行脑室内注射(i.c.v.)。N3-烯丙基-6-丙基-2-硫脲嘧啶(3)、N3-烯丙基-5,6-二甲基-2-硫脲嘧啶(10)、N3-烯丙基-1,2,3,4,5,6,7,8,9-壬氢-4-氧代-2-硫环庚基[d]嘧啶(16)和 N3-烯丙基-5-甲基-2-硫脲嘧啶(18)具有镇静催眠活性、而 N3-烯丙基-6-乙基-5-甲基-2-硫脲嘧啶(11)、N1-烯丙基-5-甲基-2-硫脲嘧啶(21)、N1-烯丙基-1、2、3、4、5、6、7、8、9-壬氢-4-氧代-2-硫代环庚基[d]嘧啶(23)和 N1-烯丙基-5,6-二甲基-2-硫脲嘧啶(24)则相反,表现出阵挛性和/或强直性惊厥发作。N3-烯丙基-6-丙基-2-硫脲嘧啶(3)和 N3-烯丙基-5-甲基-2-硫脲嘧啶(18)降低了自发活动。其他受试化合物在镇静催眠试验中没有活性,或即使在高剂量下也只有轻微活性。有 15 种化合物(1-4、7、10、11、14-16、18-21 和 23)明显延长了 PB 诱导的睡眠时间。有趣的是,只有 N1-烯丙基-5,6-二甲基-2-硫脲嘧啶(24)缩短了 PB 诱导的睡眠时间。这些结果表明,这些硫脲嘧啶具有多种不同的作用,如镇静催眠、抗惊厥和/或惊厥,而 N3-烯丙基-5-甲硫基-2-硫脲嘧啶(18)和 N1-烯丙基-5,6-二甲基-2-硫脲嘧啶(24)分别具有最强的催眠活性和对 PB 的拮抗作用。