Reacción #331420

Ecuación de reacción

3-methylenecyclobutanecarboxylic acid

C-(3-Chloropyrazin-2-yl)-methylamine bis-HCl

N-ethyl-N′-(3-dimethylaminopropyl)carbodiimide

diisopropylethylamine

→

title compound

3-Methylene-cyclobutanecarboxylic acid (3-chloropyrazin-2-ylmethyl)-amide

Disolventes

CH2Cl2

CH2Cl2

Condiciones de reacción

Tratamiento posterior

1. 1
   OtroReaction mixture
2. 2
   Concentraciónwas concentrated in vacuo
3. 3
   workup.DISSOLUTIONthe resulting residue was dissolved in EtOAc
4. 4
   Lavadowashed with water (2×), NaHCO3 (1×), water (1×), and brine (1×)
5. 5
   Secadodried over Na2SO4
6. 6
   Filtraciónfiltered
7. 7
   Concentraciónconcentrated in vacuo
8. 8
   Otrogiving crude title compound
9. 9
   OtroThe crude material was purified by chromatography on silica gel [Jones Flashmaster, 20 g/70 mL cartridge, eluting with EtOAc:Hex 10%→20%→40%→70%]

Procedimiento

C-(3-Chloropyrazin-2-yl)-methylamine bis-HCl (1.0 g, 4.62 mmol), N-ethyl-N′-(3-dimethylaminopropyl)carbodiimide (EDC) (1.31 g, 6.47 mmol, 1.4 eq.), 4-dimethylaminopyridine (DMAP) (0.141 g, 1.15 mmol, 0.25 eq.), and diisopropylethylamine (DIPEA) (2.42 mL, 1.79 g, 13.9 mmol, 3.0 eq.) were dissolved in anhydrous CH2Cl2 (25 mL). To this solution, a solution of 3-methylenecyclobutanecarboxylic acid (0.622 g, 5.54 mmol, 1.2 eq.) in anhydrous CH2Cl2 (25 mL) was added under N2 and the reaction was allowed to stir overnight at rt. Reaction mixture was concentrated in vacuo and the resulting residue was dissolved in EtOAc, washed with water (2×), NaHCO3 (1×), water (1×), and brine (1×), dried over Na2SO4, filtered, and concentrated in vacuo, giving crude title compound, as a brown oil. The crude material was purified by chromatography on silica gel [Jones Flashmaster, 20 g/70 mL cartridge, eluting with EtOAc:Hex 10%→20%→40%→70%], affording the title compound as a pale yellow solid. Additionally, the title compound could be prepared by the following route: 1,1′-Carbonyldiimidazole (CDI) (0.824 g, 5.08 mmol, 1.1 eq.) and 3-methylenecyclobutanecarboxylic acid (0.570 g, 5.08 mmol, 1.1 eq.) were dissolved in anhydrous THF (12 mL) and allowed to stir at 60° C. for 2 h. A solution of C-(3-chloropyrazin-2-yl)-methylamine bis-HCl (1.0 g, 4.62 mmol) and diisopropylethylamine (DIPEA) (2.42 mL, 1.79 g, 13.9 mmol, 3.0 eq.) in anhydrous CH2Cl2 (13 mL) was added to the acid mixture and the reaction was allowed to stir at 60° C., under N2, overnight. The reaction mixture was concentrated in vacuo and the resulting residue was dissolved in EtOAc, washed with NaHCO3 (2×) and brine (1×), dried over Na2SO4, filtered, and concentrated in vacuo, giving crude title compound, as a brown oil. The crude material was purified by chromatography on silica gel [Jones Flashmaster, 20 g/70 mL cartridge, eluting with EtOAc:Hex 10%→20%→40%→70%], affording the title compound as a pale yellow solid; 1H NMR (CDCl3, 400 MHz) δ 2.86-2.96 (m, 2H), 3.03-3.19 (m, 3H), 4.72 (dd, J=4.4, 0.8 Hz, 2H), 4.79-4.84 (m, 2H), 6.78 (s, —NH), 8.32-8.34 (m, 1H), 8.46 (d, J=2.8 Hz, 1H); MS (ES+): m/z 238.19 (90) [MH+]; HPLC: tR=2.67 min (OpenLynx, polar—7 min).

Fuente