Phosphorus oxychloride → 4-Chloro-7-fluoro-5-tetrahydropyran-4-yloxyquinazoline

HRID 1873649Notes

Reaction equation

[F:1][C:2]1[CH:11]=[C:10]2[C:5]([C:6](=O)[NH:7][CH:8]=[N:9]2)=[C:4]([O:13][CH:14]2[CH2:19][CH2:18][O:17][CH2:16][CH2:15]2)[CH:3]=1.P(Cl)(Cl)([Cl:22])=O.C(N(C(C)C)CC)(C)C>C(#N)C>[Cl:22][C:6]1[C:5]2[C:10](=[CH:11][C:2]([F:1])=[CH:3][C:4]=2[O:13][CH:14]2[CH2:19][CH2:18][O:17][CH2:16][CH2:15]2)[N:9]=[CH:8][N:7]=1

Participants

Conditions

Temperature: 80 °C

Procedure

A first portion (0.25 g) of 7-fluoro-5-tetrahydropyran-4-yloxy-3,4-dihydroquinazolin-4-one was added to a stirred mixture of phosphoryl chloride (1.76 ml), diisopropylethylamine (3.95 ml) and acetonitrile (10 ml) that had been heated to 80° C. The resultant mixture was heated to 80° C. for 3 hours. A second portion (0.25 g) of 7-fluoro-5-tetrahydropyran-4-yloxy-3,4-dihydroquinazolin-4-one was added and the mixture was heated to reflux for a further 90 minutes. There was thus obtained a solution of 4-chloro-7-fluoro-5-tetrahydropyran-4-yloxyquinazoline which was used without being isolated. A solution of 6-chloro-2,3-methylenedioxyaniline (0.32 g) in acetonitrile (3 ml) was added and the reaction mixture was heated to 80° C. for 2.5 hours. As the required conversion was incomplete, the reaction mixture was evaporated and toluene (15 ml) was added as reaction solvent. A second portion of 6-chloro-2,3-methylenedioxyaniline (0.32 g) was added and the reaction mixture was heated to reflux for 3 hours. The reaction mixture was cooled to ambient temperature and partitioned between methylene chloride and an aqueous sodium chloride solution. The organic phase was washed with water, dried over magnesium sulphate and evaporated. There was thus obtained 4-(6-chloro-2,3-methylenedioxyanilino)-7-fluoro-5-tetrahydropyran-4-yloxyquinazoline as a foam (0.73 g); NMR Spectrum: (DMSOd6) 1.9-2.05 (m, 2H), 2.1-2.2 (m, 2H), 3.5-3.6 (m, 2H), 3.8-3.95 (m, 2H), 5.1 (m, 1H), 6.1 (s, 2H), 7.0 (d, 1H), 7.1 (d, 1H), 7.3 (d, 1H), 7.4 (m, 1H), 8.6 (s, 1H), 9.3 (s, 1H).

Workup

temperaturethe mixture was heated
temperatureto reflux for a further 90 minutes

Sources & evidence

ORD record: ord-5425c98d58c3473799818326a2f8c043
Source dataset: uspto-grants-2012_11
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08304417B2

Reaction notes

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