反应详情

Following the procedure for the preparation of 3-chloro-2,5-diethylpyrazine but substituting 3-cyclopropyl-6-methylpiperazine-2,5-dione and making non-critical variations provided 3-chloro-2-cyclopropyl-5-methylpyrazine (A) and 3-chloro-5-cyclopropyl-2-methylpyrazine (B) as oils. Analytical data for 3-chloro-2-cyclopropyl-5-methylpyrazine (A): 1H NMR (CDCl3) δ 1.44, 2.35, 2.90, 3.07, 8.10; MS (ESI+) for C8H9N2Cl m/z 169 (M+H)+; Analytical data for 3-chloro-5-cyclopropyl-2-methylpyrazine (B): 1H NMR (CDCl3) δ 1.04, 2.00, 2.57, 8.10; MS (ESI+) for C8H9N2Cl m/z 169 (M+H)+.