hydrogenchloride; aluminium trichloride 1) CS2, reflux, 8 h, 2) reflux, 16 h; Yield given. Multistep reaction. Yields of byproduct given;

hydrogenchloride; aluminium trichloride multistep reaction; other NH protective groups; other N-heterocycles; influence of the N-protective groups and of ring size on the ratio of regioisomers;