New Bronchodilators. II. 3H-Imidazo(4,5-c)quinolin-4(5H)-ones.
作者:Fumio SUZUKI、Takeshi KURODA、Hiroaki HAYASHI、Yoshisuke NAKASATO、Haruhiko MANABE、Kenji OHMORI、Shigeto KITAMURA
DOI:10.1248/cpb.40.3245
日期:——
A series of novel 3-substituted imidazo[4, 5-c]quinolin-4(5H)-ones (2a-w) was prepared by the reaction of imidazo[4, 5-c]quinolin-4(5H)-ones (6) with several electrophiles under basic conditions. The bronchodilatory activity of these compounds was evaluated on the basis of their protective effects against antigen-induced contraction (the Schultz-Dale reaction) of guinea-pig trachea (in vitro) and antigen inhalation-induced bronchospasm in passively sensitized guinea-pigs (in vivo). Although correlations between in vitro and in vivo activities were not clear, short alkyl chains such as the methyl and ethyl groups at the 3-position were important for potent activity, especially in vivo. Substituents at the 5-position were more tolerant of the activity than those at the 3-position. 5-Ethyl-3-methyl-3H-imidazo[4, 5-c]quinolin-4(5H)-one (21) exhibits the most potent bronchodilatory activity among our tested compounds and is at least 5-fold more active than theophylline in vivo.
一系列新型3-取代咪唑并[4,5-c]喹啉-4(5H)-酮(2a-w)是通过咪唑并[4,5-c]喹啉-4(5H)-酮(6)与几种电化合物的反应在碱性条件下制备的。这些化合物的支气管扩张活性是根据它们对豚鼠气管(体外)抗原诱导收缩(舒尔茨-戴尔反应)和被动致敏豚鼠(体内)抗原吸入诱导支气管痉挛的保护作用来评估的。虽然体外和体内活性之间的相关性尚不清楚,但3位上的甲基和乙基等短烷基链对于有效活性非常重要,特别是在体内。5位上的取代基比