反应详情

To a solution of 5-phenylvalaric acid (0.2 g, 1.1 mmol) in 3 ml CH2Cl2 was added triethylamine (0.15 ml, 1.1 mmol), followed by isobutyl chloroformate (0.15 g, 1.1 mmol) at 0° C. After stirring for 5 minutes, a solution of 3,3-dimethyl-1-perhydropyridazinylpentane-1,2-dione (0.212 g, 1 mmol) in 1 ml CH2Cl2was added. The reaction was gradually warmed up to room temperature. The crude material was subject to silica gel purification to yield final product as clear oil (0.20 g, 55%). Rf=0.58 (33% EtOAc/hexane). 1H NMR (CDCl3, 400 MHz): δ 0.89 (t, 3H, J=7.5); 1.24 (s, 6H); 1.37 (m, 2H); 1.68 (m, 6H); 1.74 (m, 4H); 2.23 (m, 2H); 2.62 (t, 2H, J=7.60); 2.80 (m, 2H); 4.53 (m, 2H); 7.21 (m, 5H). Anal. Calcd. for C23H34N2O3: C, 71.47; H, 8.87; N, 7.25. Found: C, 71.54; H, 8.80; N, 7.32.

1. customThe crude material was subject to silica gel purification