convenient synthesis of unsymmetric multisubstituted pyridines from β-ketoesters and keteneN,S-acetals or keteneN,N-acetals has been achieved in good yields catalyzed by Zn(NO3)2·6H2O in the presence of triethylbenzylammonium (TEBA) chloride in ethanol. This reaction was carried out under economical, one-pot reaction conditions (using easily obtained starting materials, and inexpensive catalyst and