Convenient Syntheses of 2-Nitrophenylsulfen-(NPS-)imines by Oxidation of NPS-Protected Amines and Amino Acid Derivatives
2-Nitrophenylsulfenimines 2 of large structural variety are easily available from 2-nitrophenylsulfenamides 1, by direct and indirect electrochemical oxidation or by using stoichiometric amounts of a triarylamine radical cation salt.In most cases the dire