反应详情

温度

60 °C

N-Methylpiperazine (10 g, 100 mmol) was added to a stirred solution of aqueous formaldehyde (10 g of 38% solution, 100 mmol) and 3-(3,5-dimethyl-1H-pyrrol-2-ylmethylidene)-1,3-dihydro-indol-2-one, (2.38 g, 10 mmol) in methanol (100 mL). The solution heated at 60° C. for 1 h, concentrated to a low volume and the precipitate was filtered off, washed with methanol, and dried to give 2.38 g of the title compound, mp 160-164° C. HPLC Rt 4.72 min. 1H NMR (CDCl3) δ2.26 (s, 3H), 2.33 (s, 3H), 2.38 (s, 3H), 2.43 (br s, 4H), 2.70 (br s, 4H), 4.59 (s, 2H), 5.96 (d, 1H), 7.02-7.08 (m, 2H), 7.15 (dd, 1H), 7.38 (s, 1H), 7.48 (dd, 1H) and 13.0 (br s, 1H). Anal. Calcd for C21H26N4O: C, 71.97; H, 7.48; N, 15.99. Found: C, 71.75; H, 7.46; N, 15.87.

1. concentrationconcentrated to a low volume
2. filtrationthe precipitate was filtered off
3. washwashed with methanol
4. customdried