Ammonia → 4-Chloro-5-(trifluoromethyl)pyrimidin-2-amine

Ammonia in methanol (7 N solution, 15 mL) was added dropwise to stirred neat 2,4-dichloro-5-(trifluoromethyl)pyrimidine 131 (5.0 g, 23.04 mmol) under argon, and the resulting mixture was stirred at RT for 2 h. The reaction mixture was quenched with water and then extracted with ethyl acetate (2×200 mL). The combined organic layers were washed with brine, dried over Na2SO4 and filtered. The filtrate was concentrated in vacuo and the residue was purified by flash chromatography on silica gel (0-20% ethyl acetate-hexanes) to afford the product 4-chloro-5-(trifluoromethyl)pyrimidin-2-amine 132. The regio-isomer 2-chloro-5-(trifluoromethyl)pyrimidin-4-amine 133 can also be isolated.

1. customThe reaction mixture was quenched with water
2. extractionextracted with ethyl acetate (2×200 mL)
3. washThe combined organic layers were washed with brine
4. dry with materialdried over Na2SO4
5. filtrationfiltered
6. concentrationThe filtrate was concentrated in vacuo
7. customthe residue was purified by flash chromatography on silica gel (0-20% ethyl acetate-hexanes)

ORD record

ord-66eed938cb1d433f9ff3a89dffb9df05

Source dataset

uspto-grants-2016_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09388183B2