pyridine in dichloromethane T=0 - 20°C;

zinc(II) chloride

sodium iodide 1.) acetone, 56 deg C, 10 h, 2.) toluene, 100 deg C, 35 h; var.: LiI, KI or MgI2;

sodium iodide in acetonitrile T=50°C; 5.5 h;

1: tert-butyldimethylsilyl chloride; 2-ethoxy-1-[[2'-(1H-tetrazol-5-yl)biphenyl-4-yl]methyl]-1H-benzimidazole-7-carboxylic acid With triethylamine in chloroform T=20°C; 3 h; 2: 1-(cyclohexyloxycarbonyloxy)ethyl chloride With triethylamine in chloroform 24 h;

N-benzyl-N,N,N-triethylammonium chloride; potassium carbonate in tetrahydrofuran T=20 - 65°C; 6 h; Product distribution / selectivity;