Reaction de la bromo-3 pyridine avec le diisopropylamidure de lithium. Mecanismes de metallation et de migration d'halogene. Regioselectivite de l'addition polaire sur la pyridyne-3,4
作者:M. Mallet、G. Quénguiner
DOI:10.1016/0040-4020(82)80190-7
日期:1982.1
3-bromo pyridine behaviour towards lithium diisopropyl amide (LDA) in THF is studied. A careful study of the experimental conditions point to a metallation reaction in position 4 and a “halogen dance” mechanism with isomerisation into a 4-bromo pyridine. Conversion into diisopropylamino compounds occurs simultaneously with a 3 oriented elimination-addition (EA) reaction from transient isomeric lithio-derivatives
Homotransmetallation des halogeno-3 pyridines bromees en -2 ou -4 par le n-butyllithium. proposition d'un nouveau mecanisme de telesubstitution du brome
作者:M. Mallet、G. Queguiner
DOI:10.1016/s0040-4020(01)90605-2
日期:1986.1
MALLET M.; QUEGUINER G., TETRAHEDRON, 42,(1986) N 8, 2253-2262