Synthesis of imidazo(4,5-c)(1,2,6)thiadiazine 2-oxides from hydrolytes of xanthines and determination of their vasodilating activity.
作者:TSUTOMU OHSAKI、TAKEO KURIKI、TAISEI UEDA、JINSAKU SAKAKIBARA、MASAHISA ASANO
DOI:10.1248/cpb.36.877
日期:——
Novel 1, 3, 6, 7-tetrahydro-7-oxoimidazo[4, 5-c][1, 2, 6]thiadiazine 2-oxide derivatives (2a-q) were synthesized by the reaction of imidazole derivatives (1), obtained by alkaline hydrolysis of 1, 3, 7-trisubstituted xanthines (3), with SOCl2 in 42-93% yields. Chlorination of 2 with SO2Cl2 gave the 5-chloro derivatives (10a, d, i-q), though in low yields. The reaction of 2 with benzoyl chloride derivatives (14) gave 3, 7-dihydro-6H-purin-6-one derivatives (15a-d).Among 2 and 10, compounds having the phenoxyalkyl group at the l-position exhibited potent vasodilating activity on the mesenteric artery of spontaneously hypertensive rats. In particular, ED50 values of the order of 10-7 M were obtained with those having a 1-[6-(4-chlorophenoxy)hexyl]-6-propyl (2o), 6-hexyl-1-[6-(4-methoxyphenoxy)hexyl] (2p), 1-[6-(4-chlorophenoxy)hexyl]-6-hexyl (2q), 5-chloro-1-[6-(4-chlorophenoxy)hexyl]-6-methyl (101), 5-chloro-1-[4-(4-methoxyphenoxy)-butyl]-6-propyl (10m), 5-chloro-1-[6-(4-methoxyphenoxy)hexyl]-6-propyl (10n), or 5-chloro-1-[6-(4-chlorophenoxy)hexyl]-6-propyl (10o) substituent.
合成了新型的1, 3, 6, 7-四氢-7-氧代噁唑并[4, 5-c][1, 2, 6]硫二嗪2-氧化物衍生物(2a-q),反应的原料为通过碱性水解获得的1, 3, 7-三取代黄嘌呤衍生物(3)与SOCl2反应,产率为42-93%。用SO2Cl2对2进行氯化得到5-氯衍生物(10a, d, i-q),但产率较低。与苯甲酰氯衍生物(14)反应得到3, 7-二氢-6H-嘌呤-6-酮衍生物(15a-d)。在2和10中,具有苯氧烷基团位于l位的化合物在自发性高血压大鼠的肠系膜动脉上表现出强效的血管扩张活性。特别是,具有1-[6-(4-氯苯氧)己基]-6-丙基(2o),6-己基-1-[6-(4-甲氧基苯氧)己基](2p),1-[6-(4-氯苯氧)己基]-6-己基(2q),5-氯-1-[6-(4-氯苯氧)己基]-6-甲基(101),5-氯-1-[4-(4-甲氧基苯氧)-丁基]-6-丙基(10m),5-氯-1-[6-(4-甲氧基苯氧)己基]-6-丙基(10n),或5-氯-1-[6-(4-氯苯氧)己基]-6-丙基(10o)取代基的ED50值在10^-7 M的数量级。