Ammonium Chloride → HCID 86677082, Verbindung

To a mixture of N-(3-(difluoromethoxy)phenyl)-6-nitro-2-(pyrazin-2-yl) quinazolin-4-amine (1.40 g, 3.4 mmol, 1.0 eq.) in MeOH-H2O (v/v, 3:1, 110 mL) was added NH4Cl (1.80 g, 34 mmol, 10.0 eq.) and Fe (1.91 g, 34 mmol, 10.0 eq.). The resulting mixture was stirred at 60° C. for 3 h. After the reaction was completed, the mixture was cooled to room temperature, and the iron was filtered off. The filtrate was concentrated to 15 ml, and a precipitate formed and was collected and dried in vacuo to give 1.13 g of N4-(3-(difluoromethoxy)phenyl)-2-(pyrazin-2-yl)quinazoline-4,6-diamine as a pale yellow solid (87.5%). LCMS m/z=381.1 (M+1) (Method B) (retention time=1.60 min), 1H-NMR (400 MHz, DMSO-d6): δ 9.69 (s, 1H), 9.52 (d, J=1.2 Hz, 1H), 8.75 (d, J=2.4 Hz, 1H), 8.69 (d, J=2.4 Hz, 1H), 8.30 (s, 1H), 7.87 (dd, J=8.4, 0.8 Hz, 1H), 7.72 (d, J=8.8 Hz, 1H), 7.49-7.42 (m, 2H), 7.33-7.32 (m, 1H), 7.31 (t, J=7.4 Hz, 1H), 5.85 (s, 2H).

1. temperaturethe mixture was cooled to room temperature
2. filtrationthe iron was filtered off
3. concentrationThe filtrate was concentrated to 15 ml
4. customa precipitate formed
5. customwas collected
6. customdried in vacuo

ORD-Eintrag

ord-8be2ef3972144f088e5f0a9bf0a762e6

Quelldatensatz

uspto-grants-2015_07

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US09073890B2