反应详情

The title compound was prepared by (a) treating 2-chloropyrimidine-5-carbonylchloride (Example 13, 110 mg, 0.62 mmol) with ethanol (200 mg, 4.4 mmol in 1 mL of ethyl acetate) to provide 60% of ethyl 2-chloropyrimidine-5-carboxylate, (b) reaction of ethyl 2-chloropyrimidine-5-carboxylate (70 mg, 0.37 mmol) with hydrazine (100 mg, 3 mmol) to afford 44% of ethyl 4-hydrazinopyrimidine-5-carboxylate as in Example 19, (c) reaction of ethyl 4-hydrazinopyrimidine-5-carboxylate (0.36 g, 2.0 mmol) with citraconic anhydride (0.34 g, 3.0 mmol) in analogy to Example 21 to afford 10% (0.05 g) of the title compound; m.p. 95-98° C.

1. customto provide