Benzyl Bromide → 5-((Benzyloxy)methyl)-2,2-dimethyl-1,3-dioxane

HRID 1459161ノート

反応式

HRID 1459161 の反応式
[OH:1][CH2:2][CH:3]1[CH2:8][O:7][C:6]([CH3:10])([CH3:9])[O:5][CH2:4]1.[H-].[Na+].[CH2:13](Br)[C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=1>COCCOC>[CH2:13]([O:1][CH2:2][CH:3]1[CH2:8][O:7][C:6]([CH3:10])([CH3:9])[O:5][CH2:4]1)[C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=1

参加物

5

反応物 3

HCID 7498Benzyl BromideHCID 24758Sodium hydrideHCID 3584869(2,2-Dimethyl-1,3-dioxan-5-yl)methanol

生成物 1

HCID 232952655-((Benzyloxy)methyl)-2,2-dimethyl-1,3-dioxane収率 72%

試薬・触媒・溶媒 1

HCID 80711,2-Dimethoxyethane溶媒3 回

反応条件

温度
0 °C

実験手順

A solution of 5-hydroxymethyl-2,2-dimethyl-1,3-dioxane (cf:Bates, H. A.; Farina, J.; Tong, M. J. Org. Chem. 1986, 51, 2637, 3.0 g, 20.5 mmol) in 25 mL of dry DME under argon was added via cannula to a slurry of NaH (0.740 g, 80% dispersion in oil, 24.6 mmol) in 60 mL of dry DME cooled to 0° C. The resulting grey slurry was stirred at room temperature for 0.5 h, then recooled to 0° C., and treated with a solution of benzylbromide (4.56 g, 26.7 mmol) in 20 mL of DME. The reaction mixture was stirred at room temperature (rt) overnight and then quenched with 100 ml of H2O. The aqueous layer was separated and extracted with two portions of ethyl acetate. The combined organic layers were then washed with saturated sodium chloride solution, dried over MgSO4, filtered, and concentrated to provide a yellow oil. Purification by column chromatography on silica gel (ethyl acetate/hexane) afforded 3.51 g (72%) of 5-benzyloxymethyl-2,2-dimethyl-1,3-dioxane as a clear colorless liquid.

後処理

  1. customrecooled to 0° C.
  2. stirringThe reaction mixture was stirred at room temperature (rt) overnight
  3. customquenched with 100 ml of H2O
  4. customThe aqueous layer was separated
  5. extractionextracted with two portions of ethyl acetate
  6. washThe combined organic layers were then washed with saturated sodium chloride solution
  7. dry with materialdried over MgSO4
  8. filtrationfiltered
  9. concentrationconcentrated
  10. customto provide a yellow oil
  11. customPurification by column chromatography on silica gel (ethyl acetate/hexane)

出典と根拠

ORDレコード
ord-9de05460a02a4e81a6d4a39f9e92f123
出典データセット
uspto-grants-1998_12
特許番号
US05854228

反応ノート

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