Triphenylphosphine → 6-[4-[4-[2-(1-methyl-1H-pyrazol-5-yl)ethoxy]phenyl]piperazin-1-yl]-3-(trifluoromethyl)[1,2,4]triazolo[4,3-b]pyridazine

HRID 1675107Notes

Reaction equation

HRID 1675107 reaction equation
CC(OC(/N=N/C(OC(C)C)=O)=O)C.[F:15][C:16]([F:40])([F:39])[C:17]1[N:21]2[N:22]=[C:23]([N:26]3[CH2:31][CH2:30][N:29]([C:32]4[CH:37]=[CH:36][C:35]([OH:38])=[CH:34][CH:33]=4)[CH2:28][CH2:27]3)[CH:24]=[CH:25][C:20]2=[N:19][N:18]=1.[CH3:41][N:42]1[C:46]([CH2:47][CH2:48]O)=[CH:45][CH:44]=[N:43]1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1>C1COCC1>[CH3:41][N:42]1[C:46]([CH2:47][CH2:48][O:38][C:35]2[CH:36]=[CH:37][C:32]([N:29]3[CH2:28][CH2:27][N:26]([C:23]4[CH:24]=[CH:25][C:20]5[N:21]([C:17]([C:16]([F:15])([F:39])[F:40])=[N:18][N:19]=5)[N:22]=4)[CH2:31][CH2:30]3)=[CH:33][CH:34]=2)=[CH:45][CH:44]=[N:43]1

Participants

6

Reactant 4

HCID 11776TriphenylphosphineHCID 5363146Diisopropyl azodicarboxylateHCID 218324192-(1-methyl-1H-pyrazol-5-yl)ethan-1-olHCID 300088374-[4-[3-(Trifluoromethyl)[1,2,4]triazolo[4,3-b]pyridazin-6-yl]piperazin-1-yl]phenol

Product 1

HCID 441259726-[4-[4-[2-(1-methyl-1H-pyrazol-5-yl)ethoxy]phenyl]piperazin-1-yl]-3-(trifluoromethyl)[1,2,4]triazolo[4,3-b]pyridazine

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

DIAD (7.78 mL, 39.53 mmol) was added dropwise to 4-(4-(3-(trifluoromethyl)-[1,2,4]triazolo[4,3-b]pyridazin-6-yl)piperazin-1-yl)phenol (12 g, 32.94 mmol), 2-(1-methyl-1H-pyrazol-5-yl)ethanol (6.23 g, 49.41 mmol) and triphenylphosphine (12.96 g, 49.41 mmol) in THF (250 mL). The resulting solution was stirred at ambient temperature for 18 hours then split and added to a series of SCX columns (6). The crude product was eluted from the columns using 2M NH3/MeOH and the solvents evaporated. The crude product was diluted with DCM (200 mL) and washed with 2M NaOH (200 mL×2). The organic layer was dried over MgSO4, filtered and evaporated then purified by flash silica chromatography, elution gradient 0 to 3% MeOH in DCM. Pure fractions were evaporated to dryness giving a yellow solid, which was triturated with ether then dried to afford 6-(4-(4-(2-(1-methyl-1H-pyrazol-5-yl)ethoxy)phenyl)piperazin-1-yl)-3-(trifluoromethyl)-[1,2,4]triazolo[4,3-b]pyridazine anhydrous Form A (9.18 g, 59.0%) as a cream solid.

Workup

  1. customthen split
  2. additionadded to a series of SCX columns (6)
  3. washThe crude product was eluted from the columns
  4. customthe solvents evaporated
  5. additionThe crude product was diluted with DCM (200 mL)
  6. washwashed with 2M NaOH (200 mL×2)
  7. dry with materialThe organic layer was dried over MgSO4
  8. filtrationfiltered
  9. customevaporated
  10. customthen purified by flash silica chromatography, elution gradient 0 to 3% MeOH in DCM
  11. customPure fractions were evaporated to dryness
  12. customgiving a yellow solid, which
  13. customwas triturated with ether
  14. customthen dried

Sources & evidence

ORD record
ord-1b2ff45f037f49d8958730f69c812f20
Source dataset
uspto-grants-2011_08
Patent number
US08003649B2

Reaction notes

Loading…