1: 2-amino-5-bromothiazole monohydrobromide With sodium hydrogencarbonate in isopropyl alcohol Industry scale; 2: 2-(pyrrolidin-1-yl)ethanethiol in isopropyl alcohol T=60 - 70°C; 97.25 h; Industry scale;

sodium sulfate; triethylamine in dichloromethane T=5 - 20°C; Inert atmosphere;