N-methyl-N-[3-(4-diacetoxyiodo)phenoxy-1-propyl]pyrrolidinium 4-methylbenzenesulfonate; sodium hydrogencarbonate in chloroform T=60°C; 2 h; Inert atmosphere;

methyl iodide 72 h; Heating;

lithium 1.) ether, THF, reflux, 2 h, 2.) reflux, 1 h; Yield given. Multistep reaction;