59417-51-5Relevant academic research and scientific papers
6-Lithioquinoxalines and Their Transformations
Dobrodei,El'tsov
, p. 620 - 629 (2007/10/03)
6-Bromo-2,3-diphenylquinoxaline reacts with butyllithium to give the 6-lithio derivative in a yield of more than 80%, which reacts with electrophiles such as benzophenone, Michler ketone, methyl ethyl ketone, iodine, selenium, and dimethylformamide to give the corresponding quinoxaline derivatives. 6-Bromo-2,3-dimethylquinoxaline is metallated with butyl- and phenyllithium at the methyl groups and benzene ring. These organolithium compounds react with benzophenone to give the corresponding diphenyl- and triaryl-carbinols, whose yield and ratio were determined by HPLC. These results open prospects for preparing new quinoxaline derivatives substituted at the annelated benzene ring.
LATERAL METALLATION OF METHYLATED NITROGENOUS HETEROCYCLES
Kaiser, Edwin M.
, p. 2055 - 2064 (2007/10/02)
Me groups on nitrogenous heterocycles can be conveniently metallated by a variety of strongly basic reagents to afford synthetically useful carbanions.The negative charge of such anions resides predominantly on the ring N atoms.The site of lithiation on pyridines and quinolines bearing Me groups in both the 2- and 4-positions depends upon the ability of the ring N atom to complex with the metallating agents.Carbanions derived from methylated pyridines, quinolines, naphthyridines, isoquinolines, pyridocarbazoles, pteridines, pyridoindoles and quinoxalines are discussed.References are provided describing condensations of these reagents with a variety of both common and uncommon electrophiles.
