With the rapid development and complex challenges of chemical substances, new drug synthesis pathways are usually the most effective.142-64-3,Piperazine Dihydrochloride,as a common compound, the synthetic route is as follows.
A solution of 1-5 – [(3,4-dihydro-4-oxo-l-phthalazinyl) methyl] -2- fluorobenzoic acid (60.0 g, 0.20 mol)Suspended in 600 mL of acetonitrile,Anhydrous piperazine (43.0 g, 0.50 mol)Piperazine dihydrochloride (79.0 g, 0.50 mol)Concentrated sulfuric acid (2.78 ml, 0.04 mol)Heated to 78-80 C under reflux for 7 to 8 hours,Drop to room temperature,Concentrated under reduced pressure acetonitrile, water was added 1000ml, stirred for 30min; concentrated ammonia was added dropwise to a PH value of 7-8, stirred 2h, suction filtration,44.1 g of 1- [5 – [(3,4-dihydro-4-oxo-1-phthalazinyl) methyl] -2-fluorobenzoyl] piperazine was obtained in a yield of 60.1%.1- [5 – [(3,4-dihydro-4-oxo-1-phthalazin-yl) methyl] -2-fluorobenzoyl] piperazine 1H NMR, (400 MHz) see Figure 1., 142-64-3
142-64-3 Piperazine Dihydrochloride 8893, apiperazines compound, is more and more widely used in various fields.
Reference：
Patent; Shanghai Pharmaceutical Group Co., Ltd.; Deng Yu; (7 pag.)CN106554316; (2017); A;,
Piperazine – Wikipedia
Piperazines – an overview | ScienceDirect Topics