Sulfuric Acid → HCID 21458738, compound

HRID 2256709Notes

Reaction equation

HRID 2256709 reaction equation
C([O:3][C:4]([C:6]1[CH:7]=[C:8]([O:16][CH2:17][C:18]2[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=2)[C:9]2[O:14][CH2:13][CH2:12][O:11][C:10]=2[CH:15]=1)=O)C.[H-].[Al+3].[Li+].[H-].[H-].[H-].C(OCC)(=O)C.S(=O)(=O)(O)O>O1CCCC1>[CH2:17]([O:16][C:8]1[C:9]2[O:14][CH2:13][CH2:12][O:11][C:10]=2[CH:15]=[C:6]([CH2:4][OH:3])[CH:7]=1)[C:18]1[CH:19]=[CH:20][CH:21]=[CH:22][CH:23]=1

Participants

6

Reactant 4

HCID 1118Sulfuric AcidHCID 8857Ethyl AcetateHCID 21226445Aluminium lithium hydrideHCID 54189192HCID 54189192, compound

Product 1

HCID 21458738HCID 21458738, compound

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent2×

Procedure

A solution of 1.28 g of 5-benzyloxy-1,4-benzodioxane-7-carboxylic acid ethyl ester in 5 ml of tetrahydrofuran is added dropwise at room temperature to a solution of 110 mg of lithium aluminium hydride in 10 ml of tetrahydrofuran and the mixture is stirred at room temperature for a further 30 minutes. Then 0.22 ml of ethyl acetate, 1.5 ml of a mixture (water/tetrahydrofuran=1:1) and finally 2.25 ml of 2N sulfuric acid are added dropwise in succession. The reaction mixture is partitioned between diethyl ether and water. The organic phases are dried over sodium sulfate and concentrated by evaporation. The title compound is obtained from the residue by FC (240 g of silica gel, ethyl acetate/hexane=1:2): Rf (ethyl acetate-hexane=1:2)=0.18.

Workup

  1. customThe reaction mixture is partitioned between diethyl ether and water
  2. dry with materialThe organic phases are dried over sodium sulfate
  3. concentrationconcentrated by evaporation

Sources & evidence

ORD record
ord-4c50d82909e8469c82732e4200773c93
Source dataset
uspto-grants-1997_08
Patent number
US05654445

Reaction notes

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