Uses
3,6-Dibromocarbazole is used as a pharmaceutical intermediate and also an essential intermediate for synthesizing optoelectronic materials. It is the essential intermediate of synthesis of N-alkylation bromo carbazole compounds and is used to prepare N-(2-hydroxyethyl)-3,6-dibromocarbazole. The synthetic method at present has a potassium Bromide and potassium bromate hybrid system, the chloranil dehydriding of diazonium salt method, the sulfonation method, the BNS method, and the bromine bromination method.
General Description
Lithiation of 3,6-dibromocarbazole with
n-butyllithium has been studied.
Synthesis
3, 6-dibromocarbazole is synthesized with three methods, such as N-bromosuccinimide method, liquid bromine method and silica gel method. But now main method for synthesis is silica gel method. The main raw materials used in the synthesis include carbazole, N-bromosuccinimide, solvent methylene chloride, catalyst silica gel, and the yield could reach 89.5%.
References
[1] Molecular Crystals and Liquid Crystals, 2012, vol. 567, # 1, p. 102 - 109,8
[2] Organic and Biomolecular Chemistry, 2016, vol. 14, # 39, p. 9406 - 9415
[3] Patent: CN105523990, 2016, A. Location in patent: Paragraph 0012;0013;0016
[4] Journal of Materials Chemistry, 2008, vol. 18, # 12, p. 1296 - 1301
[5] Organic Letters, 2011, vol. 13, # 12, p. 3186 - 3189
