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.
N2O4被负载在交联聚
乙烯吡咯烷酮(PVP)上,形成一种固体、稳定且可回收的亚硝化剂。该试剂在温和的非均相条件下,室温下
二氯甲烷中,对二烷基胺的N-亚硝化表现出优异的选择性,相比二芳基胺、芳基烷基胺及
三烷基胺更具选择性。同时,在相似的反应条件下,该试剂也能在Primary amides和N-苯甲酰胺存在下,选择性制备N-亚硝基-N-烷基酰胺。此外,该试剂还能实现对三胺的选择性N-亚硝化和脱烷基化再N-亚硝化。