Reaction equation
[CH:1]1([N:6]2[C:10]([NH2:11])=[C:9]([C:12]([NH2:14])=[O:13])[C:8]([CH2:15][CH3:16])=[N:7]2)[CH2:5][CH2:4][CH2:3][CH2:2]1.[N:17]1([CH2:23][CH2:24][O:25][C:26]2[CH:33]=[CH:32][CH:31]=[CH:30][C:27]=2[CH:28]=O)[CH2:22][CH2:21][O:20][CH2:19][CH2:18]1>>[CH:1]1([N:6]2[C:10]3=[N:11][C:28]([C:27]4[CH:30]=[CH:31][CH:32]=[CH:33][C:26]=4[O:25][CH2:24][CH2:23][N:17]4[CH2:22][CH2:21][O:20][CH2:19][CH2:18]4)=[N:14][C:12](=[O:13])[C:9]3=[C:8]([CH2:15][CH3:16])[NH:7]2)[CH2:2][CH2:3][CH2:4][CH2:5]1Participants
Conditions
- Temperature
- 120 °C
Procedure
A mixture of 1-cyclopentyl-3-ethyl-5-amino-1H-pyrazole-4-carboxamide (0.95 g, 4.28 mmol), 2-[2-(4-morpholinyl)ethoxy]benzaldehyde (1.51 g) and xylenes (15 ml) was heated to 120° C. for 1 hour, then to 160° C. until the reaction was complete. The reaction mixture was then cooled to room temperature, the solvent was removed in vacuo, and the residue was purified by silica gel chromatography eluting with ethyl acetate (100%), followed by ethanol/ethyl acetate (1/1) to afford 1-cyclopentyl-3-ethyl-6-[2-[2-(4-morpholinyl)ethoxy]phenyl]pyrazolo[3,4-d]pyrimidin-4-one (Example 11 (b)), as an oil. The free base was then converted into its hydrochloride salt, which was recrystallized from ethanol and dried at 110° C. under high vacuum to afford 0.5 g of 1-cyclopentyl-3-ethyl-6-[2-[2-(4-morpholinyl)ethoxy]phenyl]pyrazolo[3,4-d]pyrimidin-4-one monohydrochloride, as an off-white powder, m.p. 235-237° C., labelled as Example 11 (c).
Workup
- customto 160° C.
- temperatureThe reaction mixture was then cooled to room temperature
- customthe solvent was removed in vacuo
- customthe residue was purified by silica gel chromatography
- washeluting with ethyl acetate (100%)
Sources & evidence
- ORD record
- ord-89cff62d6ad343639d13da68032ff3d2
- Source dataset
- uspto-grants-1999_09
- Patent number
- US05958929
Linked notes
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