1: 5-bromo-2-methyl-1,3-benzothiazole With lithium hexamethyldisilazane in tetrahydrofuran T=-78 - -60°C; 1.33333 h; Inert atmosphere; 2: carbonic acid diethyl ester in tetrahydrofuran T=0°C; 1 h;

acetic acid; zinc T=110°C; 0.5 h;

sodium tetrahydroborate in tetrahydrofuran; ethanol T=20°C; 2 h;