Sulfuric Acid → methyl 3-(3,4-dihydro-7-hydroxy-2-methyl-4-oxo-8-propyl-2H-1-benzopyran-2-yl)propanoate

HRID 978745

Reaction equation

HRID 978745 reaction equation
[OH:1][C:2]1[CH:18]=[CH:17][C:5]2[C:6](=[O:16])[CH2:7][C:8]([CH2:11][CH2:12][C:13]([OH:15])=[O:14])([CH3:10])[O:9][C:4]=2[C:3]=1[CH2:19][CH2:20][CH3:21].[CH3:22]OC(OC)OC.S(=O)(=O)(O)O>>[OH:1][C:2]1[CH:18]=[CH:17][C:5]2[C:6](=[O:16])[CH2:7][C:8]([CH2:11][CH2:12][C:13]([O:15][CH3:22])=[O:14])([CH3:10])[O:9][C:4]=2[C:3]=1[CH2:19][CH2:20][CH3:21]

Participants

4

Reactant 3

HCID 1118Sulfuric AcidHCID 9005Trimethyl orthoformateHCID 139207383-(3,4-dihydro-7-hydroxy-2-methyl-4-oxo-8-propyl-2H-1-benzopyran-2-yl)propanoic acid

Product 1

HCID 2801556methyl 3-(3,4-dihydro-7-hydroxy-2-methyl-4-oxo-8-propyl-2H-1-benzopyran-2-yl)propanoate

Procedure

A mixture of the title compound of Example 3 (4.3 g, 14.7 mmole), 6 ml of trimethylorthoformate, and 1.4 ml of sulfuric acid was stirred at room temperature for two hours. The reaction mixture was poured onto stirred ice/water and extracted with ethyl acetate. The organic phase was washed with water, dried over magnesium sulfate, and concentrated to an oil. The oil was purified by chromatography on silica gel, giving 3.7 g of the title compound as a crystalline solid, m.p. 101.5°-102.5° Structure assignment was consistent with nmr and infrared spectra. ##STR9##

Workup

  1. additionThe reaction mixture was poured
  2. extractionextracted with ethyl acetate
  3. washThe organic phase was washed with water
  4. dry with materialdried over magnesium sulfate
  5. concentrationconcentrated to an oil
  6. customThe oil was purified by chromatography on silica gel

Sources & evidence

ORD record
ord-1a5f4c8568f34a23afd056e082587d15
Source dataset
uspto-grants-1987_05
Patent number
US04665203

Linked notes

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