2-Benzoyl- and 2-(pyridylcarbonyl)-1-benzofuran-3-amines were prepared from 2-hydroxybenzonitrile and corresponding bromoethanone derivatives. 2-Benzoyl- and 2-(pyridylcarbonyl)-1-benzothiophene-3-amines were prepared analogously from 2-sulfanylbenzonitrile. 2-Benzoyl-1-benzofuran-3-amine treated with acetic anhydride or ethyl chloroformate provided the corresponding N-acetyl or N-ethoxycarbonyl derivatives. These N-activated compounds were alkylated with ethyl bromoacetate to provide ethyl N-acetyl-N-(2-benzoyl-1-benzofuran-3-yl)glycinate and ethyl N-(2-benzoyl-1-benzofuran-3-yl)-N-ethoxycarbonylglycinate, respectively. Their mild hydrolysis gave the corresponding glycine derivatives. Methylation of ethyl N-(2-benzoyl-1-benzofuran-3-yl)carbamate gave the corresponding N-methyl carbamate, which was hydrolyzed to N-methyl-(2-benzoyl-1-benzofuran-3-yl)amine. 2-Benzoyl-7-methoxy-1-benzofuran-3-amine and 2-(4-methoxybenzoyl)-1-benzofuran-3-amine were demethylated with boron tribromide to the corresponding hydroxy derivatives; their O-alkylation with ethyl bromoacetate than gave ethyl [(3-amino-2-benzoyl-1-benzofuran-7-yl)oxy]acetate and ethyl 4-[(3-amino-1-benzofuran-2-yl)carbonyl]phenoxy}acetate, respectively. The mild hydrolysis of these esters provided corresponding acids. Similarly, alkylation of the hydroxy derivatives with (dimethylamino)propyl chloride gave corresponding (dimethylamino)propoxy derivatives. 2-Hydroxybenzonitrile treated with 2-bromo-1-(2-, 3-, or 4-pyridyl)ethan-1-one provided the respective 2-(pyridylcarbonyl)-1-benzofuran-3-amine. Similar 2-(pyridylcarbonyl)-1-benzothiophene-3-amines were prepared analogously from 2-sulfanylbenzonitrile. 2-Benzoyl-3-(bromomethyl)-1-benzofuran treated with dimethylamine, 1-methylpiperazine, and sodium 1-methylpiperidine-4-thiolate gave the corresponding alkylation products. Several compounds were found to exhibit considerable analgesic activity.
2-苯甲酰基和2-(吡啶甲酰基)-1-苯并呋喃-3-胺是由2-羟基苯甲腈和相应的溴乙酮衍生物制备而成的。类似地,2-苯甲酰基和2-(吡啶甲酰基)-1-苯并噻吩-3-胺是由2-硫代基苯甲腈制备而成的。用乙酸酐或氯甲酸乙酯处理2-苯甲酰基-1-苯并呋喃-3-胺可得到相应的N-乙酰基或N-乙氧羰基衍生物。这些N-活化化合物与溴乙酸乙酯烷基化,得到乙基N-乙酰基-N-(2-苯甲酰基-1-苯并呋喃-3-基)甘氨酸酯和乙基N-(2-苯甲酰基-1-苯并呋喃-3-基)-N-乙氧羰基甘氨酸酯。它们经轻度水解得到相应的甘氨酸衍生物。乙基N-(2-苯甲酰基-1-苯并呋喃-3-基)氨基甲酸酯的甲基化得到相应的N-甲基氨基甲酸酯,后者水解为N-甲基-(2-苯甲酰基-1-苯并呋喃-3-基)胺。2-苯甲酰基-7-甲氧基-1-苯并呋喃-3-胺和2-(4-甲氧基苯甲酰基)-1-苯并呋喃-3-胺经三溴化硼去甲基化得到相应的羟基衍生物;它们与溴乙酸乙酯的O-烷基化反应得到乙基[(3-氨基-2-苯甲酰基-1-苯并呋喃-7-基)氧基]乙酸酯和乙基4-[(3-氨基-1-苯并呋喃-2-基)羰基]苯氧基}乙酸酯,分别。这些酯的轻度水解得到相应的酸。类似地,羟基衍生物与(二甲氨基)丙基氯化物烷基化得到相应的(二甲氨基)丙氧基衍生物。2-羟基苯甲腈与2-溴-1-(2-, 3- 或 4-吡啶基)乙酮反应得到相应的2-(吡啶甲酰基)-1-苯并呋喃-3-胺。类似地,2-(吡啶甲酰基)-1-苯并噻吩-3-胺是由2-硫代基苯甲腈类似地制备而成的。2-苯甲酰基-3-(溴甲基)-1-苯并呋喃与二甲胺、1-甲基哌嗪和硫代-1-甲基哌嗪钠盐反应得到相应的烷基化产物。发现几种化合物具有显著的镇痛活性。