Reaction of Mono-, Di-, and Trichloronitrobenzenes with<i>N</i>-Methyl Substituted Cyclic Tertiary Amines under High Pressure
作者:Toshikazu Ibata、Muhong Shang、Tetsuo Demura
DOI:10.1246/bcsj.68.2717
日期:1995.9
The reactions of mono-, di-, and trichloronitrobenzenes with 1-methylpyrrolidine under high pressure gave products of demethylation and ring-opening through a quaternary pyrrolidinium chloride intermediate formed by the SNAr reaction. On the other hand, the reactions with 1-methylpiperidine and 4-methylmorpholine gave only demethylation products. The selectivities of the reactions of 1-methylpyrrolidine
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