1: propynecarboxylic acid With 2-nitrobenzeneboronic acid in 1,2-dichloro-ethane T=40°C; 0.166667 h; Inert atmosphere; 2: benzyl azide in 1,2-dichloro-ethane T=40°C; Huisgen cycloaddition; 48 h; Inert atmosphere; regioselective reaction;

sodium hydroxide 2 h; Heating;

thionyl chloride 3 h; Heating;