Application of 402-43-7, These common heterocyclic compound, 402-43-7, name is 1-Bromo-4-(trifluoromethyl)benzene, its 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.
Example 9. Preparation of l-(4-trifluoromethyl-phenyl)-piperidiii-4-ol intermediate. A mixture of 4-hydroxypiperidine (100 mg; 0.99 mmol), 4-bromo benzotrifiuoride (0.167 mL, 1.19 mmol), tris(dibenzylideneacetone)dipalladium (37 mg; 0.04 mmol) and 2-(dicyclohexylphosphino)-2-methylbiphenyl (29 mg; 0.08 mmol) is thoroughly flushed with argon and tetrahydrofuran is added (1 mL). A molar solution of bis-(trimethylsilyl)-lithium amide in tetrahydrofuran (1.9 mL, 1.90 mmol) is added and the reaction mixture is heated at 65C. After 17 hours reaction time, aq. IM hydrochloric acid (7.5 mL) is added and the mixture is stirred for 15 minutes before neutralization by addition of aq. sat. sodium hydrogencarbonate. The mixture is extracted with ethyl acetate (2 x 10 mL). The combined organic layers are dried over sodium sulfate, filtered and evaporated under reduced pressure to yield crude l-(4-trifiuoromethyl-phenyl)-piperidin-4-ol.
Statistics shows that 1-Bromo-4-(trifluoromethyl)benzene is playing an increasingly important role. we look forward to future research findings about 402-43-7.
Reference:
Patent; INTERVET INTERNATIONAL B.V.; CHASSAING, Christophe Pierre Alain; MEYER, Thorsten; WO2010/115688; (2010); A1;,
Bromide – Wikipedia,
bromide – Wiktionary