Novel Dicationic Imidazo[1,2-<i>a</i>]pyridines and 5,6,7,8-Tetrahydro-imidazo[1,2-<i>a</i>]pyridines as Antiprotozoal Agents
作者:Mohamed A. Ismail、Reto Brun、Tanja Wenzler、Farial A. Tanious、W. David Wilson、David W. Boykin
DOI:10.1021/jm0400092
日期:2004.7.1
(3a), of the condensation reaction between 6-amino-nicotinonitrile and 2, undergoes Suzuki coupling with 4-cyanophenylboronic acid to furnish 4a in good yield. Acetate salt of 2-[5-(4-amidinophenyl)-furan-2-yl]-imidazo[1,2-a]pyridine-6-carboxamidine (8a) was obtained from 4a, through the bis-O-acetoxyamidoxime followed by hydrogenation in a mixture of ethanol/ethyl acetate. N-Methoxy-2-(5-[4-(N-met
合成2- [5-(4-A基苯基)-呋喃-2-基] -5,6,7,8-四氢咪唑并[1,2-a]吡啶-6-邻甲氧box乙酸盐(7)通过双-O-乙酰氧基ami肟将2- [5-(4-氰基苯基)-呋喃-2-基]-咪唑并[1,2-a]吡啶-6-腈(4a),然后在冰醋酸中氢化。以四个步骤获得化合物4a,首先先用N-溴代琥珀酰亚胺连续两次溴化2-乙酰基呋喃,然后再用溴连续溴化以中等产率形成α-溴-2-乙酰基-5-溴呋喃(2)。6-氨基-烟腈与2之间缩合反应的产物(3a)与4-氰基苯基硼酸进行Suzuki偶联,以高收率得到4a。从4a获得2- [5-(4-ami基苯基)-呋喃-2-基]-咪唑并[1,2-a]吡啶-6-羧am的乙酸盐(8a),通过双-O-乙酰氧基酰胺肟,然后在乙醇/乙酸乙酯的混合物中氢化。N-甲氧基-2-(5- [4-(N-甲氧基ami基)-苯基]-呋喃-2-基)-咪唑并[1,2-a]吡啶-6