in acetone T=0 - 20°C;

sodium hydride in dimethyl sulfoxide T=20°C;

1: trimethyl-sulfonium iodide With sodium hydride in dimethyl sulfoxide T=20°C; 0.5 h; 2: (3-hydroxy-2-pyridyl)methyltrimethylammonium iodide in dimethyl sulfoxide T=20°C;