Researchers who often do experiments know that organic synthesis is a process of preparing more complex target molecules from simple raw materials through one or more chemical reactions. Generally, it requires fewer steps, and cheap raw materials. 5334-40-7, name is 4-Nitro-1H-pyrazole-3-carboxylic acid, A new synthetic method of this compound is introduced below., name: 4-Nitro-1H-pyrazole-3-carboxylic acid
[00842] Example 209: 4- [ (Aminocarbonyl) amino]-l- (3-chloro-4- methoxyphenyl)-1 H-pyrazole-3-carboxamide; [00844] Step 1: Preparation of ethyl 4-nitro-1 H-pyrazole-3-carboxylate [00846] 4-Nitro-1 H-pyrazole-3-carboxylic acid (2 g, 12.73 mmol ; Aldrich) was refluxed in absolute ethanol (25 mL) containing trace sulfuric acid (0. 2. mol) for 5 h. The reaction was evaporated and partitioned between EtOAc and 5% NaHCO3. The EtOAc layer was separated, dried over MgSO4 and filtered. The EtOAc was removed to give a white solid.’H. NMR (300 MHz, DMSO-d6) : 5 1.28 (t, J=7 Hz, 3 H), 4. 34 (q, J=7 Hz, 2 H), 8.91 (s, 1 H), 14.39 (br s, 1 H); MS (ESI+) for CH N 186. 1 (M+H) +.
The basis of chemical reaction formula synthesis, the synthesis route is composed of some specific reactions and combined according to certain logical thinking. We look forward to the emergence of more reaction modes in the future.