反应详情

To a stirred solution of 2-BOC-hydrazino-5-amino pyridine (1 equivalent) in acetone (50 ml/gm) was added maleic anhydride (1.1 equivalents). The reaction mixture was stirred at 25° for 2 hours. To the reaction mixture was added acetic anhydride (1.2 equivalents), cobalt acetate (0.007 equivalents) and triethylamine (0.3 equivalents). The reaction mixture was stirred at 60° for 2 hours. The color of the reaction began as bright yellow and ended as dark yellow. The reaction mixture was concentrated under reduced pressure to give a yellow brown oil. Flash vacuum chromatography (hexanes/ethyl acetate (8/2)) was used to isolate the product. The product was recrystallized in ether/hexane; yield 28.3%; m.p. 182°-184°. IR (KBr): 3400, 3300, 3100, 2990, 1700, 1610, 1500, 1410, 1360, 1320, 1270, 1210, 1150, 1050, 830, 750, 690 cm-1.

1. stirringThe reaction mixture was stirred at 60° for 2 hours
2. concentrationThe reaction mixture was concentrated under reduced pressure
3. customto give a yellow brown oil
4. customto isolate the product
5. customThe product was recrystallized in ether/hexane