Mechanosynthesis of γ-nitro dicarbonyl compounds via CaCl2-catalyzed Michael addition

An efficient strategy for the mechanosynthesis of γ-nitro dicarbonyl esters has been developed. A CaCl2-catalyzed Michael reaction, conducted at room temperature, afforded nitroalkenes from malonates in a short reaction time and in high yields. In most cases, polymerized side-reactions are eliminated or minimized.