Butanedione → HCID 10294416, compound

HRID 1743107Notes

Reaction equation

HRID 1743107 reaction equation
[CH3:1][C:2]1[CH:7]=[CH:6][C:5]([S:8]([O:11][CH2:12][C@@H:13]2[O:18][C:17]3[C:19]([NH2:24])=[C:20]([NH2:23])[CH:21]=[CH:22][C:16]=3[O:15][CH2:14]2)(=[O:10])=[O:9])=[CH:4][CH:3]=1.[CH3:25][C:26](=O)[C:27](=O)[CH3:28]>O.C(O)C.C(=O)([O-])O.[Na+]>[CH3:1][C:2]1[CH:7]=[CH:6][C:5]([S:8]([O:11][CH2:12][CH:13]2[O:18][C:17]3=[C:19]4[C:20](=[CH:21][CH:22]=[C:16]3[O:15][CH2:14]2)[N:23]=[C:27]([CH3:28])[C:26]([CH3:25])=[N:24]4)(=[O:10])=[O:9])=[CH:4][CH:3]=1

Participants

6

Reactant 2

HCID 650ButanedioneHCID 11302542HCID 11302542, compound

Product 1

HCID 10294416HCID 10294416, compound

Reagents, catalysts & solvents 3

HCID 702EthanolSolventHCID 962WaterSolventHCID 516892Sodium BicarbonateSolvent

Conditions

Temperature
60 °C

Procedure

To a solution of [(2R)-7,8-diamino-2,3-dihydro-1,4-benzodioxin-2-yl]-methyl 4-methylbenzenesulfonate (2.170 g, 5.126 mmole) in water (50 mL) was added a solution of 2,3-butanedione (0.552 g, 6.408 mmole) in ethyl alcohol (50 mL) and the reaction mixture was heated at 60° C. for 3 hours. The reaction mixture was allowed to cool to room temperature and was diluted with aqueous sodium hydrogen carbonate (250 mL) and extracted with ethyl acetate (2×100 mL). The combined organic extracts were washed with water (100 mL), aqueous sodium chloride (100 mL), dried (magnesium sulfate) and the solvent was removed in vacuo to give a crude solid. Purification by flash column chromatography (silica, ethyl acetate:hexanes 7:3) gave 1.525 g (74%) of the (R)-enantiomer of the title compound as a white crystalline solid. Rf=0.50 (silica, ethyl acetate:hexanes 7:3); mp 153–155° C.

Workup

  1. temperatureto cool to room temperature
  2. extractionextracted with ethyl acetate (2×100 mL)
  3. washThe combined organic extracts were washed with water (100 mL), aqueous sodium chloride (100 mL)
  4. dry with materialdried (magnesium sulfate)
  5. customthe solvent was removed in vacuo
  6. customto give a crude solid
  7. customPurification by flash column chromatography (silica, ethyl acetate:hexanes 7:3)

Sources & evidence

ORD record
ord-15cae2075e174593a246871a4856bec4
Source dataset
uspto-grants-2006_03
Patent number
US07008944B2

Reaction notes

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