Ortho selectivity in SNAr substitutions of 2,4-dihaloaromatic compounds. Reactions with piperidine
作者:Michael D. Wendt、Aaron R. Kunzer
DOI:10.1016/j.tetlet.2009.11.087
日期:2010.1
A broad survey of aromatic compounds with halogens positioned both ortho and para to activatinggroups was studied in SNAr reactions with piperidine. Regioselectivities varied with the substituent group and the polarity of the solvent. Many activatinggroups exhibited an overall bias toward ortho-substitution, and this led in nonpolar solvents to very high ortho selectivity. More polar solvents uniformly