Reductive Monoalkylation of Aromatic Amines via Amidine Intermediates
作者:Jianxing Zhang、Hui-Min Chang、Robert R. Kane
DOI:10.1055/s-2001-13378
日期:——
The convenience and efficiency of using amidines as intermediates in the reductive monoalkylation of aromatic amines has been demonstrated. This monoalkylation can be performed as either a two-step synthesis or a one-pot procedure. Several examples are presented which clearly demonstrate the utility of this new method for the methylation or ethylation of aromatic amines, including unprotected nucleosides.
presence of diethylazodicarboxylate and triphenylphosphine selectively at the 5′-position to give the corresponding 4-(nucleosid-5′-yl-aci-nitro)-2,6-di-t-butylcyclohexa-2,5-dienone (aci-nitro ester of nucleoside) in 39–72% yields along with varied amounts of 5′-deoxy-5′-[N,N′-bis(ethoxycarbonyl)hydrazino]nucleosides. By comparison of the reactions of pyrimidine nucleosides having free 2′- and 3′-hydroxyl