Ethyl bromoacetate → (2,3-Dihydro-thieno[3,4-b][1,4]dioxin-2-ylmethoxy)-acetic acid ethyl ester

HRID 23753

Reaction equation

HRID 23753 reaction equation
[O:1]1[CH:6]([CH2:7][OH:8])[CH2:5][O:4][C:3]2=[CH:9][S:10][CH:11]=[C:2]12.O1CCCC1.[H-].[Na+].Br[CH2:20][C:21]([O:23][CH2:24][CH3:25])=[O:22]>C(OCC)(=O)C>[CH2:24]([O:23][C:21](=[O:22])[CH2:20][O:8][CH2:7][CH:6]1[O:1][C:2]2=[CH:11][S:10][CH:9]=[C:3]2[O:4][CH2:5]1)[CH3:25]

Participants

6

Reactant 4

HCID 7748Ethyl bromoacetateHCID 8028TetrahydrofuranHCID 24758Sodium hydrideHCID 160674382,3-Dihydrothieno(3,4-b)-1,4-dioxin-2-methanol

Product 1

HCID 20758020(2,3-Dihydro-thieno[3,4-b][1,4]dioxin-2-ylmethoxy)-acetic acid ethyl ester

Reagents, catalysts & solvents 1

HCID 8857Ethyl AcetateSolvent

Procedure

(2,3-Dihydro-thieno[3,4-b][1,4]dioxin-2-yl)-methanol (6.9 g, 40 mmol) was dissolved into tetrahydrofuran (100 mL), blanketed by nitrogen. Sodium hydride (1.9 g) was added in portions after which the reaction mixture was stirred for another 30 min. Then ethyl bromoacetate (5.3 mL) was added dropwise and stirring was continued for another hour at 25° C. The reaction mixture was then poured into ethyl acetate, washed with 1M hydrochloric acid, washed with a 1M aqueous solution of sodium hydrogen carbonate and concentrated. This resulted in quantitative formation of pure (2,3-dihydro-thieno[3,4-b][1,4]dioxin-2-ylmethoxy)-acetic acid ethyl ester as demonstrated by NMR and mass spectroscopy.

Workup

  1. stirringstirring
  2. waitwas continued for another hour at 25° C
  3. washwashed with 1M hydrochloric acid
  4. washwashed with a 1M aqueous solution of sodium hydrogen carbonate
  5. concentrationconcentrated

Sources & evidence

ORD record
ord-ffcbd940d19447389ed82df3bbd1fbd1
Source dataset
uspto-grants-2005_02
Patent number
US06852830B2

Linked notes

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