Water → (4R,9aR)-6-methoxy-4-methyl-3,4,9,9a-tetrahydro-1H-2,4a,5-triaza-fluorene-2-carboxylic acid tert-butyl ester

HRID 1272143Notes

Reaction equation

HRID 1272143 reaction equation
[C:1]([O:5][C:6]([N:8]1[CH2:20][C@@H:19]([CH3:21])[N:18]2[C@H:10]([CH2:11][C:12]3[C:17]2=[N:16][C:15]([OH:22])=[CH:14][CH:13]=3)[CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2].[H-].[Na+].[CH3:25]I.O>CN(C)C=O>[C:1]([O:5][C:6]([N:8]1[CH2:20][C@@H:19]([CH3:21])[N:18]2[C@H:10]([CH2:11][C:12]3[C:17]2=[N:16][C:15]([O:22][CH3:25])=[CH:14][CH:13]=3)[CH2:9]1)=[O:7])([CH3:4])([CH3:2])[CH3:3]

Participants

6

Reactant 4

HCID 962WaterHCID 6328Methyl iodideHCID 24758Sodium hydrideHCID 178418747HCID 178418747, compound

Product 1

HCID 69357234(4R,9aR)-6-methoxy-4-methyl-3,4,9,9a-tetrahydro-1H-2,4a,5-triaza-fluorene-2-carboxylic acid tert-butyl ester

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

To a solution of 0.25 g (0.82 mmol) (4R,9aR)-6-hydroxy-4-methyl-3,4,9,9a-tetrahydro-1H-2,4a,5-triaza-fluorene-2-carboxylic acid tert-butyl ester in 2 mL N,N-dimethylformamide, 40 mg (0.90 mmol) sodium hydride (55–65% dispersion in oil) was added. After 30 min., 0.10 mL (0.23 g, 1.64 mmol) methyl iodide was added. After 1 h the reaction mixture was poured into water and extracted three times with ethyl acetate. The combined organic layers were washed twice with water, then brine and were dried over magnesium sulfate. After filtration and evaporation of the solvent the product was purified by column chromatography on silica gel (0.032–0.063 mm) with ethyl acetate:n-hexane (1:5) as eluant.

Workup

  1. extractionextracted three times with ethyl acetate
  2. washThe combined organic layers were washed twice with water
  3. dry with materialbrine and were dried over magnesium sulfate
  4. filtrationAfter filtration and evaporation of the solvent the product
  5. customwas purified by column chromatography on silica gel (0.032–0.063 mm) with ethyl acetate:n-hexane (1:5) as eluant

Sources & evidence

ORD record
ord-a05417bece014e9d85fb339451a6564c
Source dataset
uspto-grants-2007_04
Patent number
US07208494B2

Reaction notes

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