Diisopropylethylamine → 5-Chloro-pyrazolo[1,5-a]pyrimidine-3-carboxylic acid (2-methyl-4-o-tolyl-thiazol-5-yl)-amide

HRID 474355Notes

Reaction equation

HRID 474355 reaction equation
[CH3:1][C:2]1[S:3][C:4]([NH2:14])=[C:5]([C:7]2[CH:12]=[CH:11][CH:10]=[CH:9][C:8]=2[CH3:13])[N:6]=1.C(N(C(C)C)CC)(C)C.[Cl:24][C:25]1[N:30]=[CH:29][N:28]2[N:31]=[CH:32][C:33]([C:34](Cl)=[O:35])=[C:27]2[CH:26]=1>ClCCl>[CH3:1][C:2]1[S:3][C:4]([NH:14][C:34]([C:33]2[CH:32]=[N:31][N:28]3[CH:27]=[CH:26][C:25]([Cl:24])=[N:30][C:29]=23)=[O:35])=[C:5]([C:7]2[CH:12]=[CH:11][CH:10]=[CH:9][C:8]=2[CH3:13])[N:6]=1

Participants

5

Reactant 3

HCID 81531DiisopropylethylamineHCID 580630422-Methyl-4-o-tolyl-thiazol-5-ylamineHCID 866614395-Chloropyrazolo[1,5-c]pyrimidine-3-carbonyl chloride

Product 1

HCID 580633685-Chloro-pyrazolo[1,5-a]pyrimidine-3-carboxylic acid (2-methyl-4-o-tolyl-thiazol-5-yl)-amideYield 73%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent2×

Procedure

To an ice-cooled solution of 2-methyl-4-o-tolyl-thiazol-5-ylamine (55.0 mg, 0.27 mmol, 1.0 equiv) and diisopropylethylamine (52.0 mg, 0.41 mmol, 1.5 equiv) in dichloromethane (10 mL) was added a solution of 5-chloropyrazolo[1,5-c]pyrimidine-3-carbonyl chloride (58.0 mg, 0.27 mmol, 1.0 equiv) in dichloromethane (5 mL). The reaction mixture was warmed to ambient temperature and stirred overnight. The mixture was washed with water and saturated aqueous sodium chloride solution, dried over magnesium sulfate, filtered, and concentrated under vacuum. Purification by flash column chromatography on silica gel (gradient: 0 to 3% methanol in dichloromethane) afforded 74.0 mg (73%) of 5-chloro-pyrazolo[1,5-a]pyrimidine-3-carboxylic acid (2-methyl-4-o-tolyl-thiazol-5-yl)-amide as a solid. LCMS (ESI) m+H=384.0 (mono chlorinated isotope pattern); 1H NMR (400 MHz, CDCl3) δ: 9.73 (s, 1H), 8.70 (s, 1H), 8.63 (d, 1H), 7.44-7.30 (m, 4H), 6.93 (d, 1H), 2.72 (s, 3H), 2.31 (s, 3H).

Workup

  1. washThe mixture was washed with water and saturated aqueous sodium chloride solution
  2. dry with materialdried over magnesium sulfate
  3. filtrationfiltered
  4. concentrationconcentrated under vacuum
  5. customPurification by flash column chromatography on silica gel (gradient: 0 to 3% methanol in dichloromethane)

Sources & evidence

ORD record
ord-dea8d64fc3ec4a7a8041ef02d013a218
Source dataset
uspto-grants-2014_01
Patent number
US08637526B2

Reaction notes

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