Selective N-Nitrosation of Amines,<i>N</i>-Alkylamides and<i>N</i>-Alkylureasby N<sub>2</sub>O<sub>4</sub>Supported on Cross-Linked Polyvinylpyrrolidone(PVP-N<sub>2</sub>O<sub>4</sub>)
N2O4 was supported on the cross-linked polyvinylpyrrolidone (PVP) to afford a solid, stable and recyclable nitrosating agent. This reagent shows excellent selectivity for N-nitrosation of dialkyl amines in the presence of diaryl-, arylalkyl-, trialkylamines and also for secondary amides in dichloromethane at room temperature under mild and heterogeneous conditions. Also N-nitroso-N-alkyl amides can be selectively prepared in the presence of primary amides and N-phenylamides under similar reaction conditions. Selective N-nitrosation or dealkylation and N-nitrosation of tertiary amines can also be performed by this reagent.
Tin(IV) Chloride-Sodium Nitrite as a New Nitrosating Agent for N-Nitrosation of Amines, Amides and Ureas under Mild and Heterogeneous Conditions
作者:Cyril Párkányi、Benoît Célariès
DOI:10.1055/s-2006-942397
日期:——
We have developed a new method of N-nitrosation of various secondary and tertiaryamines, amides and ureas using a mixture oftin(IV) chloride and sodium nitrate. This method leads to a selective, high-yielding and mild heterogeneous N-nitrosation by in situ generation of nitrosylchloride (NOCl). The reaction can be carried out in several different solvents such as chloroform, dichloromethane, ethers