Monobromomalononitrile: an efficient regioselective mono brominating agent towards active methylene compounds and enamines under mild conditions was written by Pathak, Sudipta;Kundu, Ashis;Pramanik, Animesh. And the article was included in RSC Advances in 2014.Formula: C4H5BrN2O This article mentions the following:
The potential of monobromomalononitrile (MBM) as a convenient source of cationic bromine in organic bromination reaction was explored. Studies reveal that MBM could be a good substitute for N-bromosuccinimide (NBS) in various respects. Enamines and active methylene compounds bearing aromatic rings were selectively mono brominated on the vinylic and active methylene group resp. on reaction with MBM. This methodol. had the advantages of easy preparation of MBM, shorter reaction time and high yields of the product formation and is environment friendly. Mono bromination reaction occurred only on active methylene groups even after addition of excess amount of MBM. Enamines containing electron withdrawing, electron donating and ortho substituted amines reacted smoothly affording only the vinylic mono bromo products in good yields without producing any side products. In the experiment, the researchers used many compounds, for example, 4-Bromo-3-methyl-1H-pyrazol-5(4H)-one (cas: 51395-52-9Formula: C4H5BrN2O).
4-Bromo-3-methyl-1H-pyrazol-5(4H)-one (cas: 51395-52-9) belongs to pyrazole derivatives. Pyrazoles, a five-membered heterocycle containing two adjacent nitrogen atoms, are the core structures found in a number of molecules that possess a wide range of pharmaceutical and agricultural activities. Pyrazoles are commonly used scaffold molecules in drug discovery projects. The use of pyrazole derivatives is based on their analgesic, anti-inflammatory, antipyretic, antiarrhythmic, sedative, muscle relaxant, neuroleptic, anticonvulsant, monoamine oxidase inhibitory, antidiabetic and antibacterial activities.Formula: C4H5BrN2O
Referemce:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics