反応 #1144427
ord-ce6514918e2842fd9a9ae7c10bda57b7
反応方程式
反応物
試薬
反応条件
後処理
- 1workup.ADDITIONadded dropwise over 30 minutes
- 2その他to react for 20 minutes
- 3その他brought to room temperature
- 4洗浄The mixture was washed with water (100 ml×5) and saturated solution of sodium hydrogencarbonate (twice),
- 5その他dried on magnesium sulfate
- 6濃縮concentrated under reduced pressure
- 7その他The residue was crystallized from ethanol
実験手順
To 250 ml of methylene chloride, 25 g (0.20 mol) of thymine and 109 ml (0.44 mol) of bistrimethylsilylacetamide were added under a nitrogen flow, and stirred for 2.5 hours at room temperature. To this mixture, 24 g (0.30 mole) of chloromethyl methyl ether and 0.59 g (1.6 mmol) of tetrabutylammonium iodide were added and heated under reflux for 1.5 hours. Then, the reaction mixture was added with 400 ml of methanol and 100 ml of water slowly and concentrated under reduced pressure. The residue was crystallized from ethyl acetate to obtain 1-(methoxymethyl)-thymine. Then, 119 ml of lithium diisopropylamide (0.25 mol) solution in tetrahydrofuran (2.1M) was added to 335 ml of tetrahydrofuran under a nitrogen flow at −70° C., to which a suspension of 17.0 g (0.10 mol) 1-(methoxymethyl)thymine in 107 ml of tetrahydrofuran added dropwise over 30 minutes. After stirring for 2.5 hours at −70° C., the reaction mixture was with a solution of 43.6 g of diphenyl disulfide in 49 ml of tetrahydrofuran dropwise over 20 minutes and allowed to react for 20 minutes. The reaction mixture was added with 35 ml of acetic acid, brought to room temperature and then added with 1 l of ethyl acetate. The mixture was washed with water (100 ml×5) and saturated solution of sodium hydrogencarbonate (twice), dried on magnesium sulfate and concentrated under reduced pressure. The residue was crystallized from ethanol to obtain 20 g of the target compound (Yield: 73%).