Imidazole → 4-chloro-1-(2-iodoethyl)-3,5-diphenyl-1H-pyrazolo[3,4-c]pyridazine

HRID 2205827Notes

Reaction equation

HRID 2205827 reaction equation
C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.N1C=CN=C1.[I:25]I.[Cl:27][C:28]1[C:33]([C:34]2[CH:39]=[CH:38][CH:37]=[CH:36][CH:35]=2)=[N:32][N:31]=[C:30]2[N:40]([CH2:49][CH2:50]O)[N:41]=[C:42]([C:43]3[CH:48]=[CH:47][CH:46]=[CH:45][CH:44]=3)[C:29]=12>C(Cl)Cl>[Cl:27][C:28]1[C:33]([C:34]2[CH:39]=[CH:38][CH:37]=[CH:36][CH:35]=2)=[N:32][N:31]=[C:30]2[N:40]([CH2:49][CH2:50][I:25])[N:41]=[C:42]([C:43]3[CH:48]=[CH:47][CH:46]=[CH:45][CH:44]=3)[C:29]=12

Participants

6

Reactant 4

HCID 795ImidazoleHCID 807IodineHCID 11776TriphenylphosphineHCID 665767242-(4-chloro-3,5-diphenyl-1H-pyrazolo[3,4-c]pyridazin-1-yl)ethan-1-ol

Product 1

HCID 866970204-chloro-1-(2-iodoethyl)-3,5-diphenyl-1H-pyrazolo[3,4-c]pyridazineYield 84.3%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

Triphenylphosphine (160 mg, 0.62 mmol), imidazole (42 mg, 0.62 mmol) and iodine (160 mg, 0.62 mmol) were added to a solution of 2-(4-chloro-3,5-diphenyl-1Hpyrazolo[3,4-c]pyridazin-1-yl)ethanol (181 mg, 0.52 mmol) in CH2Cl2 (6 mL). After stirring at ambient temperature for 1 h the reaction was filtered and solvent removed in vacuo. Purification using chromatography (silica gel, gradient 10 to 60% ethyl acetate/isohexane) gave 4-chloro-1-(2-iodoethyl)-3,5-diphenyl-1H-pyrazolo[3,4-c]pyridazine as a clear oil (202 mg) which was used as such in the subsequent step.

Workup

  1. filtrationwas filtered
  2. customsolvent removed in vacuo
  3. customPurification

Sources & evidence

ORD record
ord-b8beeae5ef824d5b9a6a0b41b348fcc1
Source dataset
uspto-grants-2016_06
Patent number
US09371332B2

Reaction notes

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