1: With 5-(2-hydroxyethyl)-4-methyl-3-(phenylmethyl)thiazolium chloride; tert-butyl alcohol in tetrahydrofuran T=20°C; 0.0833333 h; Inert atmosphere; 2: With sodium t-butanolate in tetrahydrofuran T=20°C; 12 h; Inert atmosphere; chemoselective reaction;