Acetic Anhydride → (5R)-4-chloro-5-methyl-6,7-dihydro-5H-cyclopenta[d]pyrimidin-7-yl acetate
반응식
[Cl:1][C:2]1[N:7]=[CH:6][N+:5]([O-])=[C:4]2[CH2:9][CH2:10][C@@H:11]([CH3:12])[C:3]=12.[C:13]([O:16]C(=O)C)(=[O:15])[CH3:14]>>[C:13]([O:16][CH:9]1[C:4]2[N:5]=[CH:6][N:7]=[C:2]([Cl:1])[C:3]=2[C@H:11]([CH3:12])[CH2:10]1)(=[O:15])[CH3:14]참가 물질
3
실험 절차
A solution of (R)-4-chloro-5-methyl-6,7-dihydro-5H-cyclopenta[d]pyrimidine-oxide (1.45 g, 7.85 mmol) in acetic anhydride (20 mL) was heated to 110° C. for 2 hours. After cooling, excess solvent was removed under vacuum. The residue was purified by silica gel chromatography, eluting with hexane/ethyl acetate (3:1) to give (5R)-4-chloro-5-methyl-6,7-dihydro-5H-cyclopenta[d]pyrimidin-7-yl acetate (1.25 g, 70%). 1H NMR (CDCl3, 400 MHz) δ 8.92 (m, 1H), 6.30-6.03 (m, 1H), 3.60-3.30 (m, 1H), 2.84 (m, 1H), 2.40-2.20 (m, 1H), 2.15 (d, J=6 Hz, 2H), 1.75 (m, 2H), 1.47 (d, J=6.8, 2H), 1.38 (d, J=7.2, 1H). MS (APCI+) [M+H]+227.