A simple synthesis of 4-aroyl-5-methyl-1H-imidazol-2(3H)-one derivatives (Enoxymone analogues) from aryl methyl ketones via enaminones
作者:Jure Bezenšek、Uroš Grošelj、Katarina Stare、Jurij Svete、Branko Stanovnik
DOI:10.3998/ark.5550190.p008.236
日期:——
Aryl methyl ketones 1a-e gave with N,N-dimethylacetamide dimethylacetal (DMADMA) ( E)-1aryl-3-(dimethylamino)-but-2-en-1-ones 2a-e. Substitution of the N,N-(dimethylamino) group in the reaction with ammonium acetate afforded the cor responding ( Z)-3-amino-1-aryl-but-2-en-1ones 3a-e. In the reaction of 3a-e with diethyl azodicarboxylate intermediates 4a-e were formed, which were, in most cases without
芳基甲基酮 1a-e 与 N,N-二甲基乙酰胺二甲基乙缩醛 (DMADMA) (E)-1aryl-3-(二甲氨基)-but-2-en-1-ones 2a-e 一起得到。在与乙酸铵的反应中取代 N,N-(二甲氨基) 基团得到相应的 (Z)-3-氨基-1-芳基-丁-2-烯-1 酮 3a-e。在 3a-e 与偶氮二羧酸二乙酯的反应中,形成了中间体 4a-e,在大多数情况下,它们无需分离就环化为乙基(5-芳酰基-4-甲基-2-氧代-2,3-二氢-1H-咪唑-1-基)氨基甲酸酯5a-e。酯基水解,然后中间体 6a-c,e 脱羧和脱氨基,生成 4-aroyl-5-methyl-1 Himidazol-2(3H)-ones 7a-c,e。