N,N-Dimethylaniline → 7-Chloro-5-(4-chlorophenyl)pyrazolo[1,5-a]pyrimidine

HRID 558553Notes

Reaction equation

HRID 558553 reaction equation
[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]2[CH:13]=[C:12](O)[N:11]3[N:15]=[CH:16][CH:17]=[C:10]3[N:9]=2)=[CH:4][CH:3]=1.P(Cl)(Cl)([Cl:20])=O.CN(C)C1C=CC=CC=1>>[Cl:20][C:12]1[N:11]2[N:15]=[CH:16][CH:17]=[C:10]2[N:9]=[C:8]([C:5]2[CH:6]=[CH:7][C:2]([Cl:1])=[CH:3][CH:4]=2)[CH:13]=1

Participants

4

Reactant 3

HCID 949N,N-DimethylanilineHCID 24813Phosphorus oxychlorideHCID 178515606HCID 178515606, compound

Product 1

HCID 210357027-Chloro-5-(4-chlorophenyl)pyrazolo[1,5-a]pyrimidineYield 68%

Conditions

Temperature
100 °C

Procedure

A mixture of 5-(4-chloro-phenyl)-pyrazolo[1,5-a]pyrimidin-7-ol (4.8 g, 19.5 mmol), phosphorous oxychloride (7.2 mL, 78 mmol), and N,N-dimethylaniline (0.87 mL, 7.0 mmol) was stirred at 100° C. for 2 h. The mixture was evaporated in vacuo and the residue was partitioned between water and dichloromethane. The organic phase was washed with water, dried (Na2SO4), and evaporated in vacuo. The remaining solid was crystallized from EtOAc to give 7-chloro-5-(4-chloro-phenyl)-pyrazolo[1,5-a]pyrimidine (3.50 g, 66%) as a yellow solid; mp 151-153° C.

Workup

  1. customThe mixture was evaporated in vacuo
  2. customthe residue was partitioned between water and dichloromethane
  3. washThe organic phase was washed with water
  4. dry with materialdried (Na2SO4)
  5. customevaporated in vacuo
  6. customThe remaining solid was crystallized from EtOAc

Sources & evidence

ORD record
ord-8d5a881fac7949da880959f100290c04
Source dataset
uspto-grants-2011_11
Patent number
US08063048B2

Reaction notes

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