With the rapid development and complex challenges of chemical substances, new drug synthesis pathways are usually the most effective.5308-25-8,1-Ethylpiperazine,as a common compound, the synthetic route is as follows.
EXAMPLE 24 9-(2,4-Dichloroanilino)-4-[4-(4-ethyl- 1-piperazinyl)butyl]-3 4-dihydro-2H-[1,4]oxazino[2,3-g]quinoline-8-carbonitrile An amount of 120 mg (0.26 mmol) of 4-(4-chlorobutyl)-9-(2,4-dichloroanilino)-3,4-dihydro-2H-[1,4]oxazino[2,3-g]quinoline-8-carbonitrile was stirred in N,N-dimethylformramide (0.8 mL), and to this were added sodium iodide (55 mg, 0.36 mmol), tetrabutylammonium iodide (58 mg, 0.16 mmol), and 1-ethylpiperazine (0.26 mL, 2.1 mmol). The mixture was heated at 50 C. for three hours, after which an additional amount of 1-ethylpiperazine (0.26 mL, 2.1 mmol), was added. The mixture was heated at 60 C. for 3 hours, and subsequently evaporated to a yellow oil, stirred with saturated sodium bicarbonate solution, and extracted with dichloromethane. The organic layer was washed with saturated brine solution, dried over sodium sulfate, and evaporated to a yellow oil. Purification was performed by flash chromatography (10% acetone in dichloromethane, then 70:30:5=dichloromethane: methanol: ammonium hydroxide), to give a yellow solid (74 mg, 53% yield), m.p 97-98 C.; 1H NMR (DMSO-d6) delta 9.21 (s, 1H), 8.27 (s, 1H), 7.73 (d, 1H), 7.68 (s, 1H), 7.42 (dd, 2H), 6.70 (s, 1H), 4.27 (t, 2H), 3.49 (m, 4H), 2.31 (m, 12H), 1.62 (dd, J=7 Hz, 2H), 1.52 (dd, J=7 Hz, 2H), 0.97 (t, 3H);
5308-25-8, 5308-25-8 1-Ethylpiperazine 79196, apiperazines compound, is more and more widely used in various fields.
Reference£º
Patent; American Home Products Corporation; US2003/65180; (2003); A1;,
Piperazine – Wikipedia
Piperazines – an overview | ScienceDirect Topics