反应详情

The title compound was prepared from phenethyl hydrazine (3.92 g, 0.029M) (obtained by the method of J. H. Biel U.S. Pat. No. 3,000,903) and ethyl 2,4-dioxovalerate (4.55 g, 0.029M) as described in Example 1, Preparation 1 as a yellow oil (3.84 g, 52%); νmax(CH2Cl2) 1720 cm−1; δH(CDCl3) 1.40 (3H, t, J7 Hz), 1.90 (3H, s), 3.14 (2H, t, J7 Hz), 4.30 (2H, t, J7 Hz), 4.41 (2H, q, J7 Hz), 6.48 (1H, s), 6.97-7.09 (2H, m), and 7.20-7.37 (3H, m); E.I. m/e 258.

1. customobtained by the method of J