1,1'-(9,9-Dimethyl-9H-xanthene-4,5-diyl)bis(1,1-diphenylphosphine) → HCID 58063370, compound

HRID 474348

Reaction equation

HRID 474348 reaction equation
Cl[C:2]1[CH:7]=[CH:6][N:5]2[N:8]=[CH:9][C:10]([C:11]([O:13][CH2:14][CH3:15])=[O:12])=[C:4]2[N:3]=1.[NH2:16][C:17]1[CH:22]=[CH:21][CH:20]=[C:19]([C:23]([F:26])([F:25])[F:24])[N:18]=1.C1(P(C2C=CC=CC=2)C2C3OC4C(=CC=CC=4P(C4C=CC=CC=4)C4C=CC=CC=4)C(C)(C)C=3C=CC=2)C=CC=CC=1.CC(C)([O-])C.[Na+]>[Pd].[Pd].C(=CC(C=CC1C=CC=CC=1)=O)C1C=CC=CC=1.C(=CC(C=CC1C=CC=CC=1)=O)C1C=CC=CC=1.C(=CC(C=CC1C=CC=CC=1)=O)C1C=CC=CC=1.C1(C)C=CC=CC=1>[F:26][C:23]([F:24])([F:25])[C:19]1[N:18]=[C:17]([NH:16][C:2]2[CH:7]=[CH:6][N:5]3[N:8]=[CH:9][C:10]([C:11]([O:13][CH2:14][CH3:15])=[O:12])=[C:4]3[N:3]=2)[CH:22]=[CH:21][CH:20]=1

Participants

7

Reactant 4

HCID 6360441,1'-(9,9-Dimethyl-9H-xanthene-4,5-diyl)bis(1,1-diphenylphosphine)HCID 8210242-Amino-6-(trifluoromethyl)pyridineHCID 23676156Sodium t-butoxideHCID 58063474Ethyl 5-chloropyrazolo(1,5-a)pyrimidine-3-carboxylate

Product 1

HCID 58063370HCID 58063370, compoundYield 17.3%

Reagents, catalysts & solvents 2

HCID 9832798Tris(dibenzylideneacetone) dipalladiumCatalystHCID 1140TolueneSolvent

Conditions

Temperature
140 °C

Procedure

A 20-mL microwave vial was charged with ethyl 5-chloropyrazolo[1,5-a]pyrimidine-3-carboxylate (1.28 g, 5.67 mmol, 1 equiv), 2-amino-6-(trifluoromethyl)pyridine (1.10 g, 6.81 mmol, 1.2 equiv), 4,5-bis(diphenylphosphino)-9,9-dimethylxanthene (132 mg, 0.22 mmol, 4 mol %), tris(dibenzylideneacetone) dipalladium(0) (104 mg, 0.11 mmol, 2 mol %), sodium tert-butoxide (652 mg, 6.81 mmol, 1.2 equiv) and toluene (12 mL). The vial was sealed and the contents degassed, purged with argon and then heated in a microwave reactor at 140° C. for 20 minutes. After cooling, the mixture was diluted with ethyl acetate and filtered through a pad of Celite®. The filtrate was washed with water and saturated aqueous sodium chloride solution, dried over anydrous sodium sulphate, filtered, and concentrated under vacuum. The resultant residue was purified by flash column chromatography on silica gel (gradient: 0 to 20% ethyl acetate in dichloromethane) to give 344 mg (17%) of ethyl 5-(6-(trifluoromethyl)pyridin-2-ylamino)pyrazolo[1,5-a]pyrimidine-3-carboxylate as an orange solid. LCMS (ESI) m+H=352.1; 1H NMR (300 MHz, DMSO-d6) δ: 11.06 (s, 1H), 9.16 (d, 1H), 8.94 (d, 1H), 8.39 (s, 1H), 8.10 (t, 1H), 7.57 (d, 1H), 7.05 (d, 1H), 4.31 (q, 2H), 1.40 (t, 3H).

Workup

  1. customThe vial was sealed
  2. customthe contents degassed
  3. custompurged with argon
  4. temperatureAfter cooling
  5. additionthe mixture was diluted with ethyl acetate
  6. filtrationfiltered through a pad of Celite®
  7. washThe filtrate was washed with water and saturated aqueous sodium chloride solution
  8. dry with materialdried over anydrous sodium sulphate
  9. filtrationfiltered
  10. concentrationconcentrated under vacuum
  11. customThe resultant residue was purified by flash column chromatography on silica gel (gradient: 0 to 20% ethyl acetate in dichloromethane)

Sources & evidence

ORD record
ord-8a871980f923411c83f3a5de483d0e73
Source dataset
uspto-grants-2014_01
Patent number
US08637526B2

Linked notes

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