Reaktion #618145

Reaktionsgleichung

diisopropylethylamine

5,7-Dimethylpyrazolo[1,5-a]pyrimidine-3-carboxylic acid

4-ethynylaniline

HATU

→

N-(4-ethynylphenyl)-5,7-dimethylpyrazolo[1,5-a]pyrimidine-3-carboxamide

Ausbeute 46.0%

Lösungsmittel

DMF

Reaktionsbedingungen

Aufarbeitung

1. 1
   SonstigeThe product had precipitated from reaction mixture
2. 2
   workup.ADDITIONThe reaction was diluted with water
3. 3
   Filtrationfiltered through a Büchner funnel under house vacuum
4. 4
   WaschenThe residue was washed with water (×2)
5. 5
   TrocknenCH2Cl2, diethyl ether, and air dried

Vorschrift

5,7-Dimethylpyrazolo[1,5-a]pyrimidine-3-carboxylic acid (722 mg, 3.78 mmol), 4-ethynylaniline (442 mg, 3.78 mmol), and HATU (1436 mg, 3.78 mmol) were taken up in DMF (10 ml) and then treated with diisopropylethylamine (1.979 ml, 11.33 mmol). The contents stirred at room temperature overnight. The product had precipitated from reaction mixture. The reaction was diluted with water, filtered through a Büchner funnel under house vacuum. The residue was washed with water (×2), then CH2Cl2, diethyl ether, and air dried to obtain N-(4-ethynylphenyl)-5,7-dimethylpyrazolo[1,5-a]pyrimidine-3-carboxamide (500 mg, 1.72 mmol, 46% yield). LC-MS: rt (min)=3.65. 1H NMR (400 MHz, DMSO-d6) δ ppm 2.71 (s, 3H), 2.77 (s, 3H), 4.11 (s, 1H), 7.21 (s, 1H), 7.49 (d, J=8.6 Hz, 2H), 7.77 (d, J=8.6 Hz, 2H), 8.65 (s, 1H), 10.31 (s, 1H).

Quelle