2-Brom-3-methylthiophen Chemische Eigenschaften,Einsatz,Produktion Methoden
R-S?tze Betriebsanweisung:
R25:Giftig beim Verschlucken.
R41:Gefahr ernster Augensch?den.
R43:Sensibilisierung durch Hautkontakt m?glich.
R36/37/38:Reizt die Augen, die Atmungsorgane und die Haut.
R20/21/22:Gesundheitssch?dlich beim Einatmen,Verschlucken und Berührung mit der Haut.
S-S?tze Betriebsanweisung:
S26:Bei Berührung mit den Augen sofort gründlich mit Wasser abspülen und Arzt konsultieren.
S36/37/39:Bei der Arbeit geeignete Schutzkleidung,Schutzhandschuhe und Schutzbrille/Gesichtsschutz tragen.
S45:Bei Unfall oder Unwohlsein sofort Arzt zuziehen (wenn m?glich, dieses Etikett vorzeigen).
Chemische Eigenschaften
clear colorless to light yellow liquid
Verwenden
2-Bromo-3-methylthiophene was used in the preparation of poly(3,3′′′-dimethyl-(2,2′:5′,2′:5′,2′′′)tetrathiophene)). It was also used in the preparation of 2-bromo-3-(bromomethyl)thiophene, lachrymatory compound.
Application
2-Bromo-3-methylthiophene is used as a pharmaceutical intermediate. It is used to prepare pyrazolo[3,4-d]pyrimidine derivatives as inhibitors of human enterovirus, coxsackievirus, echovirus, influenza virus, herpes simplex virus and rhinovirus. It is also used in the synthesis of oral α7 nicotinic receptor agonists.
synthetische
2-Bromo-3-methylthiophene synthesis: To a solution of glacial AcOH (100 mL), acetic anhydride (4.0 g, 0.039 mol), and 3-methylthiophene (9.82 g, 0.100 mol) as a stirred mixture was added NBS (19.6 g, 0.11 mol) in one portion with a slight exotherm to 44 oC. After 20 min the reaction mixture was poured onto ice, neutralized with sodium bisulfite and extracted with ether. The ether layer was washed with water and concentrated to give 11.3 g (64%) of 2-bromo-3-methylthiophene as a tan colored liquid in 88% purity by GC area % analysis: 1H NMR (CDCl3) d 7.1 (d, 1H, J=5.7 Hz), 6.7 (d, 1H, J=5.9 Hz), 2.2 (s, 3H).
Allgemeine Beschreibung
2-Bromo-3-methylthiophene is formed (approx. 90%) by bromination of 3-methyl thiophene with
N-bromosuccinimide in the absence of benzoyl peroxide.
2-Brom-3-methylthiophen Upstream-Materialien And Downstream Produkte
Upstream-Materialien
Downstream Produkte
