Potassium Hydroxide → 2-[6-Methyl-2-oxo-3-(2-phenylethylamino)-1-pyrazinyl]acetic acid
Reaktionsgleichung
Cl[C:2]1[N:3]=[C:4]([NH:14][CH2:15][CH2:16][C:17]2[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=2)[C:5](=[O:13])[N:6]([CH2:9][C:10]([OH:12])=[O:11])[C:7]=1[CH3:8].[OH-].[K+]>O>[CH3:8][C:7]1[N:6]([CH2:9][C:10]([OH:12])=[O:11])[C:5](=[O:13])[C:4]([NH:14][CH2:15][CH2:16][C:17]2[CH:18]=[CH:19][CH:20]=[CH:21][CH:22]=2)=[N:3][CH:2]=1Komponenten
4
Edukt 2
Produkt 1
Reagenzien, Katalysatoren, Lösungsmittel 1
Versuchsvorschrift
(5-Chloro-6-methyl-2-oxo-3-phenethylamino-2H-pyrazin-1-yl)acetic acid (13.4 g, 41.6 mmol) was added to a stirred solution of potassium hydroxide (7.28 g, 110 mmol, assuming 15% water in the pellets) in water (600 ml). After degassing the resulting solution with argon, 10% Pd/C (6.3 g) was added and the mixture then stirred under a balloon of hydrogen. After 16 h, HPLC analysis showed that 1% of the starting material remained. The mixture was filtered through Celite and the filtrate was adjusted to pH 2 with 3N KHSO4 solution. The resulting precipitate was collected by filtration and washed with water. Drying for 16 h at 0.5 mm Hg gave 1-5 as a crystalline solid: 1H NMR (DMSO-d6) δ2.11 (s, 3 H, Me), 2.87 (t, J=7.6 Hz, 2 H, PhCH2), 3.53 (br s, 2 H, CH2NH), 4.68 (s, 2 H, CH2CO2), 6.68 (s, 1 H, pyrazinone H-5), 7.20-7.31 (m, 5 H, Ph), 8.16 (br s, 1 H, NH).