Chlorination of Oximes with Aqueous H<sub>2</sub>O<sub>2</sub>/HCl System: Facile Synthesis of <i>gem</i>-Chloronitroso- and <i>gem</i>-Chloronitroalkanes, <i>gem</i>-Chloronitroso- and <i>gem</i>-Chloronitrocycloalkanes
Chlorination of cyclic and linear ketone oximes with aqueous H2O2/HCl in a two-phase dichloromethane-water system selectively affords gem-chloronitroso compounds in yields of up to 94%. One-pot oxidation of the resulting gem-chloronitroso compounds with peracetic acid, prepared in situ, gives gem-chloronitroalkanes and cycloalkanes in yields of up to 82%. The advantages of the method are that it is facile and environmentally benign and does not require gaseous chlorine.
imines or pyrrole compounds. Harnessing the power of photocatalysis, we accomplished a straightforward synthesis of 3-oxazolin-5-ones from redox-active esters and secondary nitrocompounds. Visible light-induced nondecarboxylative coupling of a redox-active ester, nitro aldol condensation, and subsequent visible light-induced N-oxide deoxygenation were accomplished within 2 h. The reaction mechanism was