Methyl iodide → 1,3-dimethyl-1,3,9,10,11,12-hexahydro-2H-quino[4,3,2-ef][1,4]benzoxazepin-2-one

HRID 981931Notes

Reaction equation

HRID 981931 reaction equation
[CH3:1][CH:2]1[C:8](=[O:9])[NH:7][C:6]2=[C:10]3[C:15](=[N:16][C:17]4=[CH:18][CH:19]=[CH:20][C:4](=[C:5]24)[O:3]1)[CH2:14][CH2:13][CH2:12][CH2:11]3.[CH3:21]C(C)([O-])C.[K+].CI>O1CCCC1>[CH3:21][N:7]1[C:6]2=[C:10]3[C:15](=[N:16][C:17]4=[CH:18][CH:19]=[CH:20][C:4](=[C:5]24)[O:3][CH:2]([CH3:1])[C:8]1=[O:9])[CH2:14][CH2:13][CH2:12][CH2:11]3

Participants

5

Reactant 3

HCID 6328Methyl iodide2×HCID 23665647Potassium tert-butoxideHCID 541566201,3,9,10,11,12-Hexahydro-3-methyl-2H-quino[4,3,2-ef][1,4]benzoxazepin-2-one

Product 1

HCID 537292451,3-dimethyl-1,3,9,10,11,12-hexahydro-2H-quino[4,3,2-ef][1,4]benzoxazepin-2-oneYield 80%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

To a suspension of 1,3,9,10,11,12-hexahydro-3-methyl-2H-quino[4,3,2-ef][1,4]-benzoxazepin-2-one (5.0 g) in dry tetrahydrofuran (150 ml) was added potassium t-butoxide (3.15 g), with stirring. After 15 mins, methyl iodide (1.39 ml) was added, and the reaction mixture was stirred at room temperature overnight. Additional methyl iodide (0.4 ml) was added. The reaction mixture was refluxed for two hrs, cooled, and concentrated. Saturated potassium carbonate solution was added and the mixture was extracted with ethyl acetate, dried over anhydrous magnesium sulfate, and filtered. The filtrate was concentrated, and the residue was adhered to silica, and flash chromatographed (30-60% ethyl acetate/hexane). The appropriate fractions were concentrated, and the residue was triturated with diethyl ether to give 4.21 g (80%) of 1,3-dimethyl-1,3,9,10,11,12-hexahydro-2H-quino[4,3,2-ef][1,4]benzoxazepin-2-one.

Workup

  1. stirringthe reaction mixture was stirred at room temperature overnight
  2. temperatureThe reaction mixture was refluxed for two hrs
  3. temperaturecooled
  4. concentrationconcentrated
  5. additionSaturated potassium carbonate solution was added
  6. extractionthe mixture was extracted with ethyl acetate
  7. dry with materialdried over anhydrous magnesium sulfate
  8. filtrationfiltered
  9. concentrationThe filtrate was concentrated
  10. customchromatographed (30-60% ethyl acetate/hexane)
  11. concentrationThe appropriate fractions were concentrated
  12. customthe residue was triturated with diethyl ether

Sources & evidence

ORD record
ord-867bc97e2b634f98b5c373900c43aedd
Source dataset
uspto-grants-1991_02
Patent number
US04994452

Reaction notes

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