p-Toluenesulfonic acid monohydrate → HCID 136408149, compound

HRID 1519414Notes

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].[Br:15][C:16]1[N:21]=[C:20]([CH:22]=O)[CH:19]=[CH:18][CH:17]=1.OS([O-])=O.[Na+].O.C1(C)C=CC(S(O)(=O)=O)=CC=1>CN(C)C(=O)C>[Br:15][C:16]1[N:21]=[C:20]([C:22]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:19]=[CH:18][CH:17]=1

Participants

Conditions

Temperature: 120 °C

Procedure

To a solution of 2-amino-4,6-dimethoxybenzamide (0.40 g, 2.04 mmol) and 6-bromopyridine-2-carbaldehyde (0.379 g, 2.04 mmol) in N,N-dimethylacetamide (24 mL) was added NaHSO3 (0.544 g, 3.06 mmol) and p-toluenesulfonic acid monohydrate (0.078 g, 0.408 mmol) at rt. The reaction mixture was heated at 120° C. for 6 h. After that time the reaction was cooled to rt, concentrated under reduced pressure and diluted with water (10 mL). The precipitated solids were collected by filtration, washed with water and dried. The product was purified by flash column chromatography (silica gel, 95:5 dichloromethane/methanol) to give 2-(6-bromopyridin-2-yl)-5,7-dimethoxyquinazolin-4(3H)-one (0.354 g, 48%) as a light yellow solid: 1H NMR (400 MHz, DMSO-d6) δ 11.25 (br s, 1H), 8.36 (d, J=7.81 Hz, 1H), 7.87-8.04 (m, 2H), 6.81 (s, 1H), 6.62 (s, 1H), 3.91 (s, 3H), 3.87 (s, 3H); ESI MS m/z 362 [M+H]+.

Workup

temperatureAfter that time the reaction was cooled to rt
concentrationconcentrated under reduced pressure
additiondiluted with water (10 mL)
filtrationThe precipitated solids were collected by filtration
washwashed with water
customdried
customThe product was purified by flash column chromatography (silica gel, 95:5 dichloromethane/methanol)

Sources & evidence

ORD record: ord-34b2d56828b84f0b8017b6f7a18eebfc
Source dataset: uspto-grants-2015_07
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09073878B2

Reaction notes

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