The syntheses and .BETA.-adrenoceptor activities of N-substituted 2-amino-5,6-dihydroxy-1,2,3,4-tetrahydro-1-naphthalenols.
作者:KATSUMI ITOH、MICHIO MOTOHASHI、HISASHI KURIKI、HIROSADA SUGIHARA、NOBUHIRO INATOMI、MASAO NISHIKAWA、YOSHIKAZU OKA
DOI:10.1248/cpb.25.2917
日期:——
A series of N-substituted 2-amino-5, 6-dihydroxy-1, 2, 3, 4-tetrahydro-1-naphthalenols (1), which are comformationally rigid derivatives of adrenergic catecholamine, were synthesized via three routes ; namely, the synthetic route in which the final step is 1) the reduction of 1-carbonyl group, 2) N-substitution by reductive alkylation of 2-amino group, or 3) removal of protecting groups of the catechol moiety. Several pairs of 1, 2-cis and trans isomers of 1 were prepared by stereoselective reactions or by separation of each stereoisomer with column chromatography or fractional crystallization. Thus, transamino alcohol (9-trans) was afforded by reduction of 2-amino-5, 6-dibenzyloxy-3, 4-dihydro-1 (2H)-naphthalenone (13) with sodium borohydride, while the cis isomer (9-cis) was obtained from 7, 8-dibenzyloxy-1, 2-dihydronaphthalene (19) via an aziridine intermediate. Several of 1 exhibited excellent β2-adrenoceptor activity superior to l-isoproterenol, the trans derivative being more potent than the cis isomer.
通过三种路线合成了一系列N-取代的2-氨基-5,6-二羟基-1,2,3,4-四氢-1-萘酚(1),它们是肾上腺素儿茶酚胺的构象刚性衍生物;即,最终步骤为1)1-羰基的还原,2)2-氨基的还原烷基化进行N-取代,或3)除去儿茶酚部分的保护基团的合成路线。通过立体选择性反应或通过柱色谱或分级结晶分离每种立体异构体来制备1的几对1、2-顺式和反式异构体。因此,通过用硼氢化钠还原2-氨基-5,6-二苄氧基-3,4-二氢-1(2H)-萘酮(13)得到反式氨基醇(9-反式),而顺式异构体(9- cis)是通过氮丙啶中间体从7,8-二苄氧基-1,2-二氢萘(19)获得的。 1 种中的几种表现出优于 l-异丙肾上腺素的优异 β2-肾上腺素受体活性,反式衍生物比顺式异构体更有效。