1: 2,3-Dibromothiophene With ethyl magnesium chloride in tetrahydrofuran T=15°C; 0.25 h; 2: p-toluenesulphonyl cyanide in tetrahydrofuran T=20 - 25°C; 1 h;

1: 2-Bromo-3-iodothiophene With ethyl magnesium chloride in tetrahydrofuran T=15°C; 0.25 h; 2: p-toluenesulphonyl cyanide in tetrahydrofuran T=20 - 25°C; 1 h; Title compound not separated from byproducts;

[BMIM(SO3H)][OTf]; trimethylsilylazide; 1-n-butyl-3-methylimidazolium hexafluorophosphate T=20 - 50°C; Schmidt Reaction; 3 h; Sonication;

acetic anhydride

1: With N-(diphenylmethylene)amine; sodium t-butanolate; tris-(dibenzylideneacetone)dipalladium(0); 9,9-dimethyl-4,5-bis(diphenyl-phosphino)xanthene in toluene T=110°C; 12 h; 2: With hydrogenchloride in 1,4-dioxane T=20°C; 2 h; 3: With triethylamine T=20°C; 0.5 h;

dihydrogen peroxide; potassium carbonate