Potassium Carbonate → HCID 11989542, compound

HRID 2224222Notes

Reaction equation

HRID 2224222 reaction equation
[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]2[CH:13]=[N:12][N:11]3[C:14](=[O:17])[NH:15][N:16]=[C:10]3[C:9]=2[C:18]2[CH:23]=[CH:22][C:21]([Cl:24])=[CH:20][CH:19]=2)=[CH:4][CH:3]=1.[O:25]1[CH2:34][CH:26]1[CH2:27][C:28]1[CH:33]=[CH:32][CH:31]=[CH:30][CH:29]=1.C([O-])([O-])=O.[K+].[K+]>CN(C=O)C.C(OCC)(=O)C>[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]2[CH:13]=[N:12][N:11]3[C:14](=[O:17])[N:15]([CH2:34][CH:26]([OH:25])[CH2:27][C:28]4[CH:33]=[CH:32][CH:31]=[CH:30][CH:29]=4)[N:16]=[C:10]3[C:9]=2[C:18]2[CH:23]=[CH:22][C:21]([Cl:24])=[CH:20][CH:19]=2)=[CH:4][CH:3]=1

Participants

6

Reactant 3

HCID 11430Potassium CarbonateHCID 948262-(Phenylmethyl)oxiraneHCID 111641617,8-bis(4-chlorophenyl)-[1,2,4]triazolo[4,3-b]pyridazin-3(2H)-one

Product 1

HCID 11989542HCID 11989542, compoundYield 70.4%

Reagents, catalysts & solvents 2

HCID 6228DimethylformamideSolventHCID 8857Ethyl AcetateSolvent

Conditions

Temperature
85 °C

Procedure

To a stirred solution of 7,8-bis(4-chlorophenyl)-[1,2,4]triazolo[4,3-b]pyridazin-3(2H)-one, (500 mg, 1.4 mmol), prepared as described in Example 1, in 7 mL of DMF was added 2,3-epoxypropylbenzene (0.18 mL, 1.4 mmol) and 0.39 g of K2CO3. The resulting red solution was heated to 85° C. for 27 h and, upon cooling to room temp, the mixture was diluted with 200 mL of ethyl acetate and 200 mL of 1N HCL. The layers were extracted, and the organic layer was washed with 200 mL of saturated aqueous NaCl. The organic layer was dried over MgSO4, filtered and evaporated to a yellow oil. The material was purified by silica gel column chromatography using a gradient of 0-100% ethyl acetate/hexanes to give 484 mg of racemic 7,8-bis(4-chlorophenyl)-2-(2-hydroxy-3-phenylpropyl)-[1,2,4]triazolo[4,3-b]pyridazin-3(2H)-one as a yellow solid containing 15% starting material 7,8-bis(4-chlorophenyl)-[1,2,4]triazolo[4,3-b]pyridazin-3(2H)-one. Separation of enantiomers was performed on 200 mg of material using Chiracel OD 5 cm×50 cm 20 micron column, flow rate 50 mL/min isocratic 65% heptane/17.5% ethanol/17.5% methanol, monochrome detection at 220 nm. Fraction A was collected at 49 min post injection to give 47 mg of 7,8-bis(4-chlorophenyl)-[1,2,4]triazolo[4,3-b]pyridazin-3(2H)-one enantiomer A as a yellow solid; Fraction B was collected at 55 min post injection to give 45 mg of 7,8-bis(4-chlorophenyl)-[1,2,4]triazolo[4,3-b]pyridazin-3(2H)-one enantiomer B as a yellow solid.

Workup

  1. temperatureupon cooling to room temp
  2. extractionThe layers were extracted
  3. washthe organic layer was washed with 200 mL of saturated aqueous NaCl
  4. dry with materialThe organic layer was dried over MgSO4
  5. filtrationfiltered
  6. customevaporated to a yellow oil
  7. customThe material was purified by silica gel column chromatography

Sources & evidence

ORD record
ord-5eb69c32537c49b2aa41ffe59bec05cb
Source dataset
uspto-grants-2008_05
Patent number
US07378418B2

Reaction notes

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