N1-Tosyl-N1, N2-diarylacetamidines (1) undergo uncleophilic attack of N-tosylamide anion at the amidine central carbon, and the less basic N-tosylamido group is expelled from the intermediate, resulting in an amide exchange reaction. Reaction of 1 and N-arylcarboxamide afforded N1-acyl-N1, N2-diarylacetamidine (2). N1-(p-Chlorobenzoyl)-N1-(p-methoxyphenyl)-N2-(p-chlorophenyl)acetamidine (2a) could not be obtained as such, but was obtained as an equilibrium mixture of 2a and N1-(p-chlorobenzoyl)-N1-(p-chlorophenyl)-N2-(p-methoxyphenyl)acetamidine (2a') owing to rapid 1, 3-N, N-acylotropic rearrangement.N1-Acyl derivatives of unsymmetrical N1, N2-disubstituted formamidines could be isolated as such, showing that 1, 3-N, N-acyl migration takes place more slowly in the acylated formamidine system. An acyl derivative of formamidine in which the acyl group is attached at the less basic nitrogen of amidine underwent 1, 3-N.N-acyl migration to give another acyl derivative at elevated temperature.Reaction of N1-tosyl-N1-(p-nitrophenyl)-N2-(m-nitrophenyl)acetamidine (1h) and N-acylarylamines gave N1-acyl-N1-aryl-N2-(m-nitrophenyl)acetamidines (2) which underwent alcoholysis to give carboxylic acid ester and N1-aryl-N2-(m-nitrophenyl)acetamidines (3) at room temperature, and the latter was hydrolyzed to give arylamines and N-acetyl-m-nitroaniline on heating in aqueous tetrahydrofuran solution in the presence of acetic acid. Thus, the alcoholysis of N-acylarylamines was achieved under mild conditions.
N1-托斯基基-N1, N2-二芳基
乙醇胺(1)在N-托斯基酰胺阴离子对胺基中间碳的亲核攻击下发生反应,较弱基础性的N-托斯基酰胺基团从中间体中排出,导致酰胺交换反应。1与N-芳基羧酰胺的反应生成N1-酰基-N1, N2-二芳基
乙醇胺(2)。N1-(对
氯苯甲酰基)-N1-(对
甲氧基苯基)-N2-(对
氯苯基)
乙醇胺(2a)无法单独获得,而是作为2a和N1-(对
氯苯甲酰基)-N1-(对
氯苯基)-N2-(对
甲氧基苯基)
乙醇胺(2a')的平衡混合物获得,这归因于快速的1, 3-N, N-酰基转位。非对称N1, N2-二取代福尔马胺的N1-酰基衍
生物能够作为独立物质分离出来,显示在酰基福尔马胺系统中,1, 3-N, N-酰基迁移的速度较慢。一种在胺基的较弱基本氮原子上连接酰基的福尔马胺酰基衍
生物在升高温度下经历1, 3-N, N-酰基迁移,形成另一种酰基衍
生物。N1-托斯基基-N1-(对
硝基苯基)-N2-(间
硝基苯基)
乙醇胺(1h)与N-酰基芳胺反应生成N1-酰基-N1-芳基-N2-(间
硝基苯基)
乙醇胺(2),该化合物在室温下发生醇解,生成
羧酸酯和N1-芳基-N2-(间
硝基苯基)
乙醇胺(3),后者在
水合
四氢呋喃溶液中与
醋酸共同加热时
水解生成芳胺和N-乙酰-
间硝基苯胺。因此,N-酰基芳胺的醇解是在温和条件下实现的。