1: trimethyl-oxo-sulfonium iodide With n-butyllithium in tetrahydrofuran; hexane T=-78 - 0°C; 0.5 h; 2: 4-methyl-N-(oxiran-2-ylmethyl)benzenesulfonamide With N,N'-dimethyl-N,N'-propyleneurea in tetrahydrofuran; hexane 2 h; Heating; Further stages.;