p-Toluenesulfonic acid → 2-[4-(3-hydroxy-propyl)-3,5-dimethyl-phenyl]-5,7-dimethoxy-3H-quinazolin-4-one

HRID 591742Notes

Reaction equation

[NH2:1][C:2]1[CH:10]=[C:9]([O:11][CH3:12])[CH:8]=[C:7]([O:13][CH3:14])[C:3]=1[C:4]([NH2:6])=[O:5].[OH:15][CH2:16][CH2:17][CH2:18][C:19]1[C:26]([CH3:27])=[CH:25][C:22]([CH:23]=O)=[CH:21][C:20]=1[CH3:28].OS([O-])=O.[Na+].CC1C=CC(S(O)(=O)=O)=CC=1>CN(C)C(=O)C>[OH:15][CH2:16][CH2:17][CH2:18][C:19]1[C:26]([CH3:27])=[CH:25][C:22]([C:23]2[NH:6][C:4](=[O:5])[C:3]3[C:2](=[CH:10][C:9]([O:11][CH3:12])=[CH:8][C:7]=3[O:13][CH3:14])[N:1]=2)=[CH:21][C:20]=1[CH3:28]

Participants

Conditions

Temperature: 115 °C

Procedure

To a solution of 2-amino-4,6-dimethoxy-benzamide (0.80 g, 4.00 mmol) and 4-(3-hydroxy-propyl)-3,5-dimethyl-benzaldehyde (0.98 g, 5.1 mmol) in N,N-dimethylacetamide (15 mL) were added NaHSO3 (58.5 wt %, 0.80 g, 4.40 mmol) and p-TSA (0.155 g, 0.81 mmol) and the reaction mixture was heated at 115° C. for 16 hours, then cooled to room temperature. N,N-dimethylacetamide was removed under reduced pressure. The residue was diluted with water (50 mL), stirred for 30 minutes, and then filtered and washed with water. The crude compound was purified by column chromatography (silica gel 230-400 mesh; 5% methanol in dichloromethane as eluent) to give 2-[4-(3-hydroxy-propyl)-3,5-dimethyl-phenyl]-5,7-dimethoxy-3H-quinazolin-4-one as an off-white solid. Yield: 1.10 g (73%).

Workup

temperaturecooled to room temperature
customN,N-dimethylacetamide was removed under reduced pressure
additionThe residue was diluted with water (50 mL)
filtrationfiltered
washwashed with water
customThe crude compound was purified by column chromatography (silica gel 230-400 mesh; 5% methanol in dichloromethane as eluent)

Sources & evidence

ORD record: ord-1802a8191897432384e0f2c7077e90ce
Source dataset: uspto-grants-2016_01
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09238640B2

Reaction notes

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