With the rapid development and complex challenges of chemical substances, new drug synthesis pathways are usually the most effective.883554-88-9,4-Carbamoyl-piperazine-1-carboxylic acid tert-butyl ester,as a common compound, the synthetic route is as follows.
883554-88-9, Intermediate 28: Piperazine-1-carboxylic acid amide hydrochloride; [] 4-Piperazine-1-carboxylic acid tert-butyl ester (1.0g, 5.4mmol), acetic acid (3ml) and water (5ml) were mixed together. Potassium cyanate (2.25g, 27.7mmol) was added portionwise as a solution in water (5ml) and stirred for 4 hours, during which time a solid precipitated. The solid was filtered, re-dissolved in DCM (20ml), dried over MgSO4, filtered, the filter cake washed with DCM (5vol) and concentrated in vacuo to give a white solid (0.38g). The white solid (0.38g) was dissolved in methanol (3.8ml) and 1,4-dioxane (0.7ml), 4M HCl in 1,4-dioxane (2.5ml, 10mmol) was added to the reaction and stirred overnight. The reaction was concentrated in vacuo to give the title compound (0.28g, 31% over 2 steps) as a white solid.1H NMR (400MHz, DMSO-d6) delta9.18 (br s, 2H), 3.91 (br s, 2H), 3.45 (br s, 4H), 2.93 (br s, 4H).
As the paragraph descriping shows that 883554-88-9 is playing an increasingly important role.
Reference£º
Patent; Warner-Lambert Company LLC; EP1593679; (2005); A1;,
Piperazine – Wikipedia
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