申请人:Rane Ramkrishna Appaji
公开号:US20130303781A1
公开(公告)日:2013-11-14
The present invention discloses a method for preparing Triclabendazole comprising condensing N-(4,5-dichloro-2-ni-trophenyl)acetamide with 2,3-dichlorophenol to obtain 4-chloro-5(2,3-dichlorophenoxy)-2-nitrophenyl acetamide and it to obtain 4-chloro-5(2,3-dichlorophenoxy)-2-nitroaniline; reducing 4-chloro-5(2,3-dichlorophenoxy)-2-nitroaniline in presence of Raney nickel to obtain 4-chloro-5-(2,3-dichlorophenoxy)benzene-1,2-diamine of; cyclising 4-chloro-5-(2,3-dichlorophenoxy)benzene-1,2-diamine in presence of carbondisulfide to obtain 6-chloro-5-(2,3-dichlorophenoxy)-1H-benzimidazole-2-thiol; methylating 6-chloro-5-(2,3-dichlorophenoxy)-1H-benzimidazole-2-thiol using a methylating agent to obtain triclabendazole methanesulfonate salt; converting triclabendazole methanesulfonate salt to hydrochloride salt of Triclabendazole and hydrolysing it to obtain Triclabendazole.
本发明公开了一种制备三氯苯咪唑的方法,包括将N-(4,5-二氯-2-硝基苯基)乙酰胺与2,3-二氯苯酚缩合以获得4-氯-5-(2,3-二氯苯氧基)-2-硝基苯乙酰胺,然后将其转化为4-氯-5-(2,3-二氯苯氧基)-2-硝基苯胺;在Raney镍存在下还原4-氯-5-(2,3-二氯苯氧基)-2-硝基苯胺以获得4-氯-5-(2,3-二氯苯氧基)苯-1,2-二胺;在碳二硫存在下使4-氯-5-(2,3-二氯苯氧基)苯-1,2-二胺环化以获得6-氯-5-(2,3-二氯苯氧基)-1H-苯并咪唑-2-硫醇;使用甲基化剂对6-氯-5-(2,3-二氯苯氧基)-1H-苯并咪唑-2-硫醇进行甲基化以获得三氯苯咪唑甲磺酸盐;将三氯苯咪唑甲磺酸盐转化为三氯苯咪唑的盐酸盐,并对其进行水解以获得三氯苯咪唑。