Cesium carbonate → 2,7-Dichloro-6-(3,5-dimethoxyphenyl)quinazoline

HRID 56458Notes

Reaction equation

Br[C:2]1[CH:3]=[C:4]2[C:9](=[CH:10][C:11]=1[Cl:12])[N:8]=[C:7]([Cl:13])[N:6]=[CH:5]2.[CH3:14][O:15][C:16]1[CH:17]=[C:18](B(O)O)[CH:19]=[C:20]([O:22][CH3:23])[CH:21]=1.C(=O)([O-])[O-].[Cs+].[Cs+]>C1COCC1.O.Cl[Pd](Cl)([P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1)[P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1>[Cl:13][C:7]1[N:6]=[CH:5][C:4]2[C:9](=[CH:10][C:11]([Cl:12])=[C:2]([C:18]3[CH:17]=[C:16]([O:15][CH3:14])[CH:21]=[C:20]([O:22][CH3:23])[CH:19]=3)[CH:3]=2)[N:8]=1

Participants

Conditions

Temperature: 85 °C

Procedure

A mixture of 6-bromo-2,7-dichloroquinazoline (3 g, 10.8 mmol), 3,5-dimethoxyphenylboronic acid (2.2 g, 11.9 mmol), cesium carbonate (1.06 g, 32.4 mmol) and Pd(PPh3)2Cl2 (702 mg, 1.08 mmol) in THF (50 mL) and water (10 mL) was degassed with nitrogen three times, and the reaction mixture was stirred at 85° C. for 3 hours. The reaction mixture was cooled to room temperature and directly concentrated. The residue was purified by silica gel chromatography (petroleum ether:ethyl acetate=10:1˜4:1) to give the title compound (2.0 g, yield: 55%) as a yellowish solid. MS (ES+) requires: 334, 336, C16H12Cl2N2O2, found: 335, 337 [M+H]+.

Workup

customwas degassed with nitrogen three times
temperatureThe reaction mixture was cooled to room temperature
concentrationdirectly concentrated
customThe residue was purified by silica gel chromatography (petroleum ether:ethyl acetate=10:1˜4:1)

Sources & evidence

ORD record: ord-b33af2bbe03b45bfb3e6fc220985eba3
Source dataset: uspto-grants-2016_09
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09434700B2

Reaction notes

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