Ethyl Bromide → 1-ethyl-3-methyl-1,3,9,10,11,12-hexahydro-2H-quino[4,3,2-ef][1,4]benzoxazepin-2-one
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:22](C)([O-])C.[K+].BrCC>O1CCCC1>[CH2:21]([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)[CH3:22]Participants
Reactant 3
Product 1
Reagents, catalysts & solvents 1
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 (4.82 g) in dry tetrahydrofuran (150 ml) was added potassium tert-butoxide (2.42 g), with stirring. After 20 mins, bromoethane (5.37 ml) was added, and the reaction mixture was refluxed overnight. The reaction mixture was concentrated, diluted with saturated potassium carbonate solution, and extracted with ethyl acetate. The organic extracts were dried over anhydrous magnesium sulfate, concentrated, and the residue was adhered to silica and flash chromatographed (30% ethyl acetate/hexane). The appropriate fractions were concentrated. Trituration of the residue with diethyl ether/pentane (1/1) gave 4.51 g (85%) of 1-ethyl-3-methyl-1,3,9,10,11,12-hexahydro-2H-quino[4,3,2-ef][1,4]benzoxazepin-2-one.
Workup
- temperaturethe reaction mixture was refluxed overnight
- concentrationThe reaction mixture was concentrated
- additiondiluted with saturated potassium carbonate solution
- extractionextracted with ethyl acetate
- dry with materialThe organic extracts were dried over anhydrous magnesium sulfate
- concentrationconcentrated
- customchromatographed (30% ethyl acetate/hexane)
- concentrationThe appropriate fractions were concentrated
Sources & evidence
- ORD record
- ord-abf97870a96846bab7aab8093681537b
- Source dataset
- uspto-grants-1991_02
- Patent number
- US04994452
Reaction notes
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