Isopropanol → 2,3-Dihydro-4-methyl-2-[2-(4-morpholinyl)ethyl]-pyrido[3,2-f][1,4]oxazepin-5(4H)-one maleate
Reaction equation
Cl.Cl[CH2:3][CH2:4][CH:5]1[CH2:11][N:10]([CH3:12])[C:9](=[O:13])[C:8]2[CH:14]=[CH:15][CH:16]=[N:17][C:7]=2[O:6]1.[OH-].[Na+].C(O)(C)C.[C:24]([OH:31])(=[O:30])/[CH:25]=[CH:26]\[C:27]([OH:29])=[O:28].[NH:32]1[CH2:37][CH2:36][O:35][CH2:34][CH2:33]1>>[C:24]([OH:31])(=[O:30])/[CH:25]=[CH:26]\[C:27]([OH:29])=[O:28].[CH3:12][N:10]1[C:9](=[O:13])[C:8]2[CH:14]=[CH:15][CH:16]=[N:17][C:7]=2[O:6][CH:5]([CH2:4][CH2:3][N:32]2[CH2:37][CH2:36][O:35][CH2:34][CH2:33]2)[CH2:11]1Participants
Reactant 5
Product 1
Procedure
2-(2-Chloroethyl)-2,3-dihydro-4-methylpyrido[3,2-f][1,4]oxazepin-5(4H)-one hydrochloride, 16 g (058 mole) was dissolved in morpholine (30 ml) and stirred overnight at room temperature. To the solution was added dilute sodium hydroxide solution (50 ml) and the resulting mixture extracted with chloroform (3×30 ml). The chloroform was removed on the rotary evaporator with aspiration. The residual morpholine was removed in vacuo at 50° C. (rotary evaporator). To the residual free base (15.5 g, 0.053 mole) was added isopropyl alcohol (1 liter) and maleic acid (9.24 g, 0.080 mole). The mixture was heated to boiling and the clear solution cooled at 20° C. for several hours. The resulting crystals, 16 g (68.1%), were recrystallized from isopropyl alcohol, m.p. 163°-165° C.
Workup
- extractionthe resulting mixture extracted with chloroform (3×30 ml)
- customThe chloroform was removed on the rotary evaporator with aspiration
- customThe residual morpholine was removed in vacuo at 50° C.
- custom(rotary evaporator)
- temperatureThe mixture was heated
- temperaturethe clear solution cooled at 20° C. for several hours
- customThe resulting crystals, 16 g (68.1%), were recrystallized from isopropyl alcohol, m.p. 163°-165° C.
Sources & evidence
- ORD record
- ord-e88430ba01054e65a5ef5c6620b23ddc
- Source dataset
- uspto-grants-1989_03
- Patent number
- US04810795
Reaction notes
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