Hydrazine → N-((1S)-2-amino-1-{[2-(trifluoromethyl)phenyl]methyl}ethyl)-5-chloro-4-(1-methyl-1H-pyrazol-5-yl)-2-furancarboxamide

To a solution of 5-chloro-N-((1S)-2-(1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl)-1-{[2-(trifluoromethyl)phenyl]methyl}ethyl)-4-(1-methyl-1H-pyrazol-5-yl)-2-furancarboxamide (202 mg, 0.36 mmol) in tetrahydrofuran (1.8 ml) and methanol (1.8 ml) at 25° C. was added hydrazine (0.08 ml, 2.54 mmol) dropwise. After 12 h the solution was concentrated, dry loaded onto silica and purified by column chromatography (2% MeOH in DCM (1% NH4OH)). The free base was transferred to the HCl salt by addition of excess 2M HCl in diethyl ether (2 ml) to the residue in DCM (2 ml) affording the HCl salt of N-((1S)-2-amino-1-{[2-(trifluoromethyl)phenyl]methyl}ethyl)-5-chloro-4-(1-methyl-1H-pyrazol-5-yl)-2-furancarboxamide (120 mg, 0.24 mmol, 66% yield) as a yellow solid: LCMS (ES) m/z=427, 429 (M, M+2)+, 1H NMR (400 MHz, DMSO-d6) δ ppm 8.87 (d, J=9.09 Hz, 1H) 8.11 (br. s., 3H) 7.66-7.73 (m, 2H) 7.57 (t, J=7.45 Hz, 2H) 7.53 (d, J=1.52 Hz, 1H) 7.44 (d, J=6.82 Hz, 1H) 6.50 (d, J=1.52 Hz, 1H) 4.43-4.51 (m, 1H) 3.86 (s, 3H) 2.99-3.17 (m, 4H).

1. concentrationAfter 12 h the solution was concentrated
2. customdry loaded onto silica
3. custompurified by column chromatography (2% MeOH in DCM (1% NH4OH))
4. additionThe free base was transferred to the HCl salt by addition of excess 2M HCl in diethyl ether (2 ml) to the residue in DCM (2 ml)

ORD record

ord-590b54c3a0c040bab74b4c140fbb01e5

Source dataset

uspto-grants-2015_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08946278B2