With the rapid development and complex challenges of chemical substances, new drug synthesis pathways are usually the most effective.20327-23-5,1-Cyclopropylpiperazine,as a common compound, the synthetic route is as follows.
Example 277 Synthesis of 3-[1-{4-[2-(4-Cyclopropyl-piperazin-1-yl)-2-oxo-ethyl]-3,5-dimethyl-1H-pyrrol-2-yl }-meth-(Z)-ylidene]-5-(2,6-dichloro-phenylmethanesulfonyl)-1,3-dihydro-indol-2-one A mixture of {5-[5-(2,6-dichloro-phenylmethanesulfonyl)-2-oxo-1,2-dihydro-indol-(3Z)-ylidenemethyl]-2,4-dimethyl-1H-pyrrol-3-yl}-acetic acid (208 mg, 0.4 mmol), HOBt (54 mg, 1 eq.) and EDAC (153 mg, 2 eq.) in DMF (1.5 mL) was stirred at rt for 30 mins. To the mixture was added 1-cyclopropyl-piperazine (101 mg, 2 eq.) in DMF (1.5 mL). After stirring at rt for overnight, the precipitate was collected by vacuum filtration, washed with water, sodium bicarbonate and ether to give 108 mg (43%) of the titled compound. 1H-NMR (400 MHz, DMSO-d6) delta 13.46 (s, 1H, NH), 11.26 (s, 1H, NH), 8.17 (d, 1H), 7.76 (s, 1H), 7.48 (d, 1H), 7.46 (s, 1H), 7.36 (m, 2H), 6.99 (d, J=8 Hz, 1H), 4.84 (s, 2H), 3.49 (s, 2H), 3.46 (m, 2H), 3.39 (m, 2H), 2.47 (m, 4H), 2.25 (s, 3H, CH3), 2.22 (s, 3H, CH3), 1.6 (m, 1H), 0.4 (m, 2H), 0.31 (m, 2H). MS m/z 625 [M-1]., 20327-23-5
As the paragraph descriping shows that 20327-23-5 is playing an increasingly important role.
Reference：
Patent; SUGEN, INC.; US2003/125370; (2003); A1;,
Piperazine – Wikipedia
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