Adding a certain compound to certain chemical reactions, such as: 313735-62-5, name is 4-Bromo-1-isopropylpyrazole, belongs to pyrazoles-derivatives compound, can increase the reaction rate and produce products with better performance than those obtained under traditional synthetic methods. Here is a downstream synthesis route of the compound 313735-62-5, COA of Formula: C6H9BrN2
n–Butyllithium (2.5M in hexanes, 1.38 mL, 3.45 mmol) was added over 15 min to a solution of 4-bromo-1-isopropyl-1H-pyrazole (500 mg, 2.65 mmol) in diethyl ether (10 mL) at -78 C. After 30 min, a solution of tri-n-butylstannane chloride (920 muL, 3.45 mmol) in diethyl ether (1 mL) was added and the resultant reaction mixture was left to stir at -78 C for 1 h, then allowed to warm to ambient temperature. The reaction mixture was diluted with diethyl ether (40 mL) and washed with water (20 mL), then brine (20 mL). The organic layer was separated, dried over sodium sulfate, filtered and evaporated in vacuo to afford the title product as a colourless oil (98 mg, 94%) which was used without further purification. 1H-NMR (CDCl3, 400MHz): 7.46- 7.42 (m, 1 H); 7.28 (t, J = 4.2Hz, 1 H); 4.59-4.43 (m, 1 H); 1.58-1.42 (m, 12 H); 1.39-1.24 (m, 6 H); 1.02-0.77 (m, 15 H).
At the same time, in my other blogs, there are other synthetic methods of this type of compound, 4-Bromo-1-isopropylpyrazole, and friends who are interested can also refer to it.
Reference:
Patent; GENENTECH, INC.; WO2009/151598; (2009); A1;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics