Synthesis and biological evaluation of 4-fluoro-, 7-fluoro-, and 4,7-difluoro-5,6-dihydroxytryptamines
作者:Masami Kawase、Achintya K. Sinhababu、Eva M. McGhee、Terry Milby、Ronald T. Borchardt
DOI:10.1021/jm00170a026
日期:1990.8
synthesized from 3-fluoroanisole (1) and 1,4-difluoro-2,3-dimethoxybenzene (13), respectively. Efficient methods were developed for the conversion of 1 to 4-fluoro- and 7-fluoro-5,6-bis(benzyloxy)indoles (12a,b, respectively), and 13 to 4,7-difluoro-5,6-[( diphenylmethylene)dioxy]indole (19) via reductive cyclization of 2-nitro-beta-(dialkylamino)styrenes prepared in situ from 2-nitrotoluenes. Indoles 12a
合成了5,6-二羟基色胺(5,6-DHT)衍生物4-氟-和7-氟-5,6-DHT(26a,b)和4,7-二氟-5,6-DHT(26c)分别由3-氟茴香醚(1)和1,4-二氟-2,3-二甲氧基苯(13)制成。已开发出有效的方法,用于将1转化为4-氟-和7-氟-5,6-双(苄氧基)吲哚(分别为12a,b)和从13转化为4,7-二氟-5,6- [ (二苯基亚甲基)二氧基]吲哚(19)是由2-硝基甲苯就地制备的2-硝基-β-(二烷基氨基)苯乙烯的还原环化反应。然后通过相应的吲哚-3-乙腈将吲哚12a,b和19转化为26a-c。用分光光度法测定,氟取代的5,6-DHTs显示出增加的苯酚酸度,并且通过循环伏安法测定,其发生氧化的固有电势降低。从抑制26a,c和5,6-DHT的IC50值分别得出117、125、135和92 microM的IC50值判断,氟取代对细胞毒性潜能没有明显的不利影响,从而抑制了