Electric Literature of 113808-86-9,Some common heterocyclic compound, 113808-86-9, name is 3,5-Dimethylpyrazole-4-carboxylic Acid, molecular formula is C6H8N2O2, traditional synthetic route has been very mature, but the traditional synthetic route has various shortcomings, such as complicated route, low yield, poor purity, etc, below Introduce a new synthetic route.
Preparation of Examples 251-253; The piperazine Example 1 (220 mg), EDC (i.e., 1-(3- dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride) (245 mg), HOBT (i.e., 1-hydroxybenzotriazole) (172 mg), acid (108 mg), and JPr2NEt (206 mg) were taken up in CH3CN and stirred at 25C (18 h). The solution was partitioned15 between EtOAc and 1 N NaOH(aq.). The aqueous layer was extracted with EtOAc. The combined organic layers were washed with brine and dried (MgSO4). Filtration and concentration gave a solid. The solid was triturated with Et2O. The white solid was collected and dried to give 125 mg (42 %) of Example 251.
These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route 3,5-Dimethylpyrazole-4-carboxylic Acid, its application will become more common.
Reference:
Patent; SCHERING CORPORATION; WO2006/60461; (2006); A1;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics