Electric Literature of 2075-46-9,Some common heterocyclic compound, 2075-46-9, name is 4-Nitro-1H-pyrazole, molecular formula is C3H3N3O2, 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.
The solution of 4-nitro-1H-pyrazole (SM6, 10 g, 88.44 mmol), NaH(60%, 1.3 eq, 4.60 g, 114.97mmol) and iodomethane (SM7, 25 g, 177 mmol) in Dry DMF (100 ml) was stirred at 0C overnight, and then cooled to room temperature and quenched with water (200 mL) and extracted with EA. The organic layer was dried over anhydrous Na2SO4 to obtain the target compound 12(11 g, 92 % yield).
These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route 4-Nitro-1H-pyrazole, its application will become more common.
Reference:
Patent; Hangzhou Rex Pharmaceutical Co., Ltd; WANG, Yonghui; ZHOU, Juan; GAO, Yujun; WANG, Dong; HONG, Binbin; SHEN, Ximing; WU, Yaodong; LI, Chunqi; EP3476848; (2019); A1;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics