Ethyl 3-oxohexanoate → HCID 178439499, compound
Reaction equation
[Cl:1][C:2]1[C:9]([CH3:10])=[CH:8][CH:7]=[CH:6][C:3]=1[CH:4]=O.[NH2:11][C:12]1[CH:16]=[CH:15][NH:14][N:13]=1.O=[C:18]([CH2:25][CH2:26][CH3:27])[CH2:19][C:20]([O:22][CH2:23][CH3:24])=[O:21]>>[Cl:1][C:2]1[C:9]([CH3:10])=[CH:8][CH:7]=[CH:6][C:3]=1[CH:4]1[C:19]([C:20]([O:22][CH2:23][CH3:24])=[O:21])=[C:18]([CH2:25][CH2:26][CH3:27])[NH:11][C:12]2=[N:13][NH:14][CH:15]=[C:16]12Participants
Procedure
A suspension of 2-chloro-m-xylene (15 ml), N-bromosuccinimide (23.3 g) and benzoyl peroxide (200 mg) in carbon tetrachloride (150 ml) was heated under reflux for 6 hours. The insoluble material was filtered off and the filtrate was concentrated under reduced pressure. The obtained residue was purified by silica gel column chromatography (eluent:hexane) to give 2-bromomethyl-1-chloro-6-methylbenzene (16.0 g) as a colorless oil. 2-Bromomethyl-1-chloro-6-methylbenzene (25.4 g) and hexamethylenetetramine (32.4 g) were dissolved in acetic acid-water (1:1, 10 ml) and the mixture was heated under reflux for 5 hours. To the reaction mixture was added concentrated hydrochloric acid (40 ml) and the mixture was heated under reflux for 1 hour. The reaction mixture was extracted with ethyl acetate. The extract was washed with an aqueous sodium hydrogencarbonate solution and a saturated aqueous sodium chloride solution, and dried over anhydrous magnesium sulfate. The solvent was evaporated to give 2-chloro-3-methylbenzaldehyde (19.4 g) as a yellow oil. Subsequently, the title compound was prepared from 2-chloro-3-methylbenzaldehyde, 3-aminopyrazole and ethyl 3-ketohexanoate in the same manner as in Example 25.
Sources & evidence
- ORD record
- ord-777bc7be108f48fbad28ee8e7d9004f1
- Source dataset
- uspto-grants-2005_12
- Patent number
- US06977262B2
Reaction notes
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