Studies on xanthine derivatives. II. Synthesis of 1,2,3,7-tetrahydro-6H-purin-6-ones from xanthine hydrolyzates.
作者:TSUTOMU OHSAKI、TAKEO KURIKI、TAISEI UEDA、JINSAKU SAKAKIBARA
DOI:10.1248/cpb.34.36
日期:——
Intramolecular cyclization of caffeidine homologues (2a and 2b) in the presence of ethanolic hydrogen chloride gave 9-oxo-1H-pyrrolo[1, 2-α]purine (4a) and 11-oxo-1H-azepino[1, 2-α]purine (4b) derivatives, both containing a 1, 2, 3, 7-tetrahydro-6H-purin-6-one ring system. Purine ring system compounds, 2-monosubstituted (7) and 2, 2, -disubstituted (8) 1, 2, 3, 7-tetrahydro-6H-purin-6-ones, were synthesized by intermolecular cyclization between caffeidine and aldehydes (5) or ketones (6) in the presence of acid catalysts. Pyrolysis of 4, 7, 8, 9, 9a, 11-hexahydro-1, 4, 9a-trimethyl-5, 11-dioxo-1H, 5H-imidazo[4, 5-f]pyrrolo[2, 1-b][1, 3, 5]-oxadiazocine hydrochloride (9·HCl) derived from a urea derivative (3a) afforded 4a and 1, 4-dimethyl-4, 5-dihydro-5, 7-dioxo-1H, 7H-imidazo[4, 5-d][1, 3]oxazine (11). Many of these compounds (4, 7 and 8) showed relaxing activity against KCl-induced contraction of arterial strips isolated from the rabbit mesenterium, and potent activity was observed in the case of 71.
在乙醇氢氯酸存在下,咖啡啶同系物(2a和2b)发生分子内环化,生成含有1,2,3,7-四氢-6H-嘌呤-6-酮环系的9-氧代-1H-吡咯并[1,2-α]嘌呤(4a)和11-氧代-1H-氮杂庚英并[1,2-α]嘌呤(4b)衍生物。通过咖啡啶与醛(5)或酮(6)在酸催化剂作用下的分子间环化反应合成了含有嘌呤环系的化合物,即2-单取代(7)和2,2-二取代(8)的1,2,3,7-四氢-6H-嘌呤-6-酮。从脲衍生物(3a)衍生得到的4,7,8,9,9a,11-六氢-1,4,9a-三甲基-5,11-二氧代-1H,5H-咪唑并[4,5-f]吡咯并[2,1-b][1,3,5]-氧二唑盐酸盐(9·HCl)的热解产物为4a和1,4-二甲基-4,5-二氢-5,7-二氧代-1H,7H-咪唑并[4,5-d][1,3]恶唑(11)。这些化合物中的许多(4,7和8)显示出对来自兔肠系膜的动脉条在氯化钾诱导的收缩中具有松弛活性,其中71表现出了强效活性。