sodium hydride in 1,4-dioxane T=0 - 20°C; Methylation; 17 h;

1: 51 percent / pyridinium dichromate / CH2Cl2 / 5 h / 0 °C 2: 36 percent / LiAlH4 / tetrahydrofuran / 2 h / 20 °C 3: 54 percent / NaH / dioxane / 17 h / 0 - 20 °C View Scheme

sulfuric acid 10 h; Heating;