Amidines. V. Smiles rearrangement of N1-(p-nitrobenzenesulfonyl)-N1,N2-diarylacetamidines.
作者:Machiko ONO、Ichiro ARAYA、Shinzo TAMURA
DOI:10.1248/cpb.38.1373
日期:——
N1-Tosyl-N1, N2-diarylacetamidine (1) suffered nucleophilic attack of N-tosylamines and N-acylamines at the amidine central carbon to give N1-tosyl and N1-acyl derivatives of N-1, N2-disubstituted acetamidine in the presence of a basic catalyst.Preparation of N1-(p-nitrobenzenesulfonyl)-N1, N2-diarylacetamidines (8) was attempted to obtain better starting materials for the above amide exchange reaction. These compounds, however, proved to be unsuitable for the purpose because they readily underwent Smiles rearrangement to give N1-(p-nitrophenyl-N1, N2-diarylacetamidines (9) with loss of sulfur dioxide.N1-(p-Nitrophenyl)-N1-(p-methylphenyl)-N2-(p-chlorophenyl)acetamidine (9d) was formed when an ethanol solution of N1-(p-nitrobenzenesulfonyl)-N1-(p-chlorophenyl)-N2-(p-methylphenyl)acetamidine (8d) was refluxed for 2.5h in the absence of any catalyst.
N1-甲苯磺酰基-N1,N2-二芳基乙脒(1)在脒中心碳上受到N-甲苯磺胺和N-酰胺的亲核攻击,得到N-1,N2-二取代乙脒的N1-甲苯磺酰基和N1-酰基衍生物尝试制备N1-(对硝基苯磺酰基)-N1,N2-二芳基乙脒(8)以获得用于上述酰胺交换反应的更好的起始原料。然而,这些化合物被证明不适合该目的,因为它们很容易进行 Smiles 重排,得到 N1-(对硝基苯基-N1, N2-二芳基乙脒 (9)),同时失去二氧化硫。 N1-(对硝基苯基)-N1当 N1-(对硝基苯磺酰基)-N1-(对氯苯基)-N2-(对甲基苯基)乙脒的乙醇溶液(9d)形成-(对甲基苯基)-N2-(对氯苯基)乙脒(9d)。 8d)在没有任何催化剂的情况下回流2.5小时。