反应详情

DIAD (3.24 mL, 16.47 mmol) was added dropwise to 4-{4-[3-(trifluoromethyl)[1,2,4]triazolo[4,3-b]pyridazin-6-yl]piperazin-1-yl}phenol (obtained as described in Example 16, preparation of starting materials) (5 g, 13.72 mmol), tert-butyl 4-(3-hydroxypropyl)piperazine-1-carboxylate (CAS 132710-90-8, 5.03 g, 20.59 mmol) and triphenylphosphine (5.40 g, 20.59 mmol) in THF (50 mL) at 0° C. under nitrogen. The resulting solution was stirred at ambient temperature for 16 hours. The reaction mixture was evaporated to dryness and redissolved in DCM (100 mL), and washed sequentially with 2M NaOH (100 mL) and saturated brine (100 mL). The organic layer was dried over MgSO4, filtered and evaporated to afford crude product. The crude product was purified by flash silica chromatography, eluting with EtOAc. Pure fractions were evaporated to dryness to give tert-butyl 4-[3-(4-{4-[3-(trifluoromethyl)[1,2,4]triazolo[4,3-b]pyridazin-6-yl]piperazin-1-yl}phenoxy)propyl]piperazine-1-carboxylate (3.66 g, 45%).

1. customThe reaction mixture was evaporated to dryness
2. dissolutionredissolved in DCM (100 mL)
3. washwashed sequentially with 2M NaOH (100 mL) and saturated brine (100 mL)
4. dry with materialThe organic layer was dried over MgSO4
5. filtrationfiltered
6. customevaporated
7. customto afford crude product
8. customThe crude product was purified by flash silica chromatography
9. washeluting with EtOAc
10. customPure fractions were evaporated to dryness