With the rapid development and complex challenges of chemical substances, new drug synthesis pathways are usually the most effective.4318-42-7,1-Isopropylpiperazine,as a common compound, the synthetic route is as follows.
A mixture of l-(4-methoxybenzyl)-7-(3-oxoazetidin-l-yl)-l,5-naphthyridin-2(lH)-one (C-7) (5.796 g, 17.3 mmol, 1.0 eq) and 1-isopropylpiperazine (4.432 g, 34.6 mmol, 2.0 eq) in DCM (150 mL) and acetic acid (0.5 mL) was heated at reflux temperature for 3 h, then NaBH(OAc)3 (7.33 g, 34.6 mmol, 2.0 eq) was added in portions and the resulting mixture was kept reflux overnight. The reactant mixture was cooled and diluted with H20 (300 mL) and extracted with DCM (4 x 100 mL). The combined organic layers were washed with brine, dried over Na2S04 and filtered. The filtrate was concentrated in vacuo and the residue was purified by flash column chromatography on silica gel (2-5percent MeOH-DCM) to afford the desired product l-(4-methoxybenzyl)-7-(3-(4-isopropylpiperazin-l- yl)azetidin-l-yl)-l,5-naphthyridin-2(lH)-one (C-8) (5.6 g, 72.3percent yield ) as a pale solid. :H NMR (300 MHz, CDCl3-<3/4) delta: 7.83 (d, J = 7.5 Hz, 1H), 7.78 (s, 1H), 7.15 (d, J = 6.9 Hz, 2H), 6.85 (d, J = 6.6 Hz, 2H), 6.72 (d, J = 7.2 Hz, 1H), 6.37 (s, 1H), 5.40 (s, 2H), 4.02 (m, 2H), 3.78 (m, 5H), 3.67 (m, 1H), 3.51 (m, 1H), 3.42 (m, 1H), 2.97 (m,lH), 2.80 (m, 4H), 2.55 (m, 2H), 1.17 (d, J= 4.8 Hz, 6H); ESI-MS m/z : 448.3 [M+H]+. 4318-42-7, 4318-42-7 1-Isopropylpiperazine 78013, apiperazines compound, is more and more widely used in various fields.
Reference：
Patent; INTELLIKINE, INC.; REN, Pingda; LIU, Yi; LI, Liansheng; CHAN, Katrina; WILSON, Troy, Edward; CAMPBELL, Simon, Fraser; WO2011/149937; (2011); A1;,
Piperazine – Wikipedia
Piperazines – an overview | ScienceDirect Topics