Boron tribromide → 2-(5-(piperazin-1-yl)-1,3,4-thiadiazol-2-yl)-5-(1H-pyrazol-1-yl)phenol

BBr3 (1M solution in heptane, 1.56 mL, 1.56 mmol) was added to a stirred, nitrogen flushed solution of tert-butyl 4-(5-(2-methoxy-4-(1H-pyrazol-1-yl)phenyl)-1,3,4-thiadiazol-2-yl)piperazine-1-carboxylate (138 mg, 0.312 mmol) in DCM (6 mL) and the resulting bright yellow suspension was stirred at room temperature for 16 hours. The reaction mixture was quenched by addition of MeOH (10 mL) to give a suspension. The solid was collected by vacuum filtration, rinsed with MeOH, and re-dissolved in a mixture of DMSO and water. The solution was loaded onto a 5 g SCX cartridge (pre-wet with MeOH) and the cartridge was washed with DMSO/water (5 mL), MeOH (20 mL), then flushed with 7M NH3 in MeOH (30 mL). The MeOH/NH3 was removed in vacuo to afford the crude product as an off-white solid. The crude material was sonicated in MeOH (5 mL) and the resulting suspension filtered under vacuum to afford the title compound as an off-white solid (69 mg, 68% yield). LC-MS: Rt 0.76 min; MS m/z 329.2 [M+H]+ [Method A]. 1H NMR (400 MHz, DMSO-d6) δ ppm 8.50 (d, J=2.53 Hz, 1H), 8.03 (d, J=8.59 Hz, 1H), 7.77 (d, J=1.52 Hz, 1H), 7.52 (d, J=2.02 Hz, 1H), 7.42 (dd, J=8.59, 2.02 Hz, 1H), 6.55-6.61 (m, 1H), 3.42-3.48 (m, 4H), 2.80-2.91 (m, 4H).

1. customThe reaction mixture was quenched by addition of MeOH (10 mL)
2. customto give a suspension
3. filtrationThe solid was collected by vacuum filtration
4. washrinsed with MeOH
5. dissolutionre-dissolved in a mixture of DMSO and water
6. washthe cartridge was washed with DMSO/water (5 mL), MeOH (20 mL)
7. customflushed with 7M NH3 in MeOH (30 mL)
8. customThe MeOH/NH3 was removed in vacuo
9. customto afford the crude product as an off-white solid
10. filtrationthe resulting suspension filtered under vacuum

ORD record

ord-937e84940e254c64874f2a6af64a41e2

Source dataset

uspto-grants-2015_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09040712B2