Formaldehyde → 2-(3-(2-(2-((4-(1-Methylpiperidin-4-yl)phenyl)amino)-5-(trifluoromethyl)pyrimidin-4-yl)ethyl)pyrazin-2-yl)acetamide

2-(3-(2-(2-((4-(Piperidin-4-yl)phenyl)amino)-5-(trifluoromethyl)pyrimidin-4-yl)ethyl)pyrazin-2-yl)acetamide (26) (42 mg, 0.087 mmol) was dissolved in methanol (4 mL) and 37% formaldehyde (26 μL, 0.35 mmol) was added. After five minutes sodium tri(acetoxy)borohydride (92 mg, 0.44 mmol) was added and the mixture stirred for three hours. The solution was concentrated, and the residue suspended in 10% sodium hydroxide (1 mL). After five minutes brine (2 mL) was added, and the mixture extracted with ethyl acetate (5×3 mL). The combined ethyl acetate phases were washed with brine, dried (sodium sulphate) and evaporated to give the title compound (27) (34 mg, 77% yield) as an off-white solid; 1H NMR (400 MHz, d6-DMSO) δ 10.07 (s, 1H), 8.64 (s, 1H), 8.42 (d, J=2.6 Hz, 1H), 8.38 (d, J=2.6 Hz, 1H), 7.61 (s, 1H), 7.55 (d, J=7.3 Hz, 2H), 7.15 (d, J=8.5 Hz, 2H), 7.08 (s, 1H), 4.09 (d, J=4.7 Hz, 1H), 3.77 (s, 2H), 3.17 (d, J=4.3 Hz, 2H), 3.05-2.92 (m, 2H), 2.33 (s, 3H), 2.20 (s, 2H), 1.82-1.61 (m, 4H). LCMS Method C: rt 4.53 min; m/z 500.1 [M+H]+; m/z 498.2 [M−H]−.

1. concentrationThe solution was concentrated
2. additionAfter five minutes brine (2 mL) was added
3. extractionthe mixture extracted with ethyl acetate (5×3 mL)
4. washThe combined ethyl acetate phases were washed with brine
5. dry with materialdried (sodium sulphate)
6. customevaporated

ORD record

ord-f6aed99a6c5d423bb7b57c457deee328

Source dataset

uspto-grants-2016_08

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09421205B2