1: 4-Bromo-2-trimethylsilylthiazole With n-butyllithium in diethyl ether; hexane T=-78°C; 0.5 h; 2: tributyltin chloride in diethyl ether; hexane T=-78 - 20°C; 1 h; 3: With sodium hydroxide in diethyl ether; hexane; water

methanol; aluminum oxide; ammonia in chloroform