1: 2-(3-furyl)ethyl bromide With magnesium in tetrahydrofuran 2.5 h; 2: chloro-trimethyl-silane; cyclohexenon With copper(l) iodide; N,N,N',N,-tetramethylethylenediamine; triethylamine in tetrahydrofuran T=-78 - 20°C; 5 h;