Electric Literature of 2075-45-8, The chemical industry reduces the impact on the environment during synthesis 2075-45-8, name is 4-Bromo-1H-pyrazole, I believe this compound will play a more active role in future production and life.
4-Bromo-1-ethyl-1H-pyrazole_: To a suspension of NaH (0.196 g, 8.16 mmol) in THF (15 ml_) was added 4-bromo- 1 H-pyrazole (1 g, 6.80 mmol) in THF (5 ml_) at 0 C, under nitrogen atmosphere, and strirred for 20 min. Ethyl iodide (0.825 ml_, 10.21 mmol) was added at 0 C and stirred at RT for 2 h. The reaction mixture was quenched with cold water, and extracted with EtOAc (2X). The organic layer washed with brine, dried under anhydrous Na2S04and filtered. The filtrate was concentrated and was purified by column chromatography to afford 4- bromo-1-ethyl-1 H-pyrazole (900 mg, 5.12 mmol, 75 % yield). LC-MS m/z 174 (M+H)+, 1.84 min (ret. time).
In the field of chemistry, the synthetic routes of compounds are constantly being developed and updated. I will also mention this compound in other articles, 4-Bromo-1H-pyrazole, other downstream synthetic routes, hurry up and to see.
Reference:
Patent; GLAXOSMITHKLINE INTELLECTUAL PROPERTY DEVELOPMENT LIMITED; ASTEX THERAPEUTICS LIMITED; BOEHM, Jeffrey Charles; DAVIES, Thomas Glanmor; WOOLFORD, Alison Jo-anne; GRIFFITHS-JONES, Charlotte Mary; WILLEMS, Hendrika Maria Gerarda; NORTON, David; SAXTY, Gordon; HEIGHTMAN, Thomas Daniel; LI, Tindy; KERNS, Jeffrey K.; DAVIS, Roderick S.; YAN, Hongxing; WO2015/92713; (2015); A1;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics