Polymer-supported organotin reagents for regioselective halogenation of aromatic amines.
[reaction: see text] Polymer-supported triorganotin halides were used in the halogenation reaction of aromatic amines. Treatment of aromatic amines with n-butyllithium and polymer-supported organotin halides gave the corresponding polymer-bound N-triorganostannylamines, which by treatment with bromine or iodine monochloride gave the para-halogenated aromatic amines with high yields and high selectivities. The polymer-supported organotin halides reagents regenerated during the course of the halogenation reaction can be reused without loss of efficiency. The presence of tin residues in halogenated aromatic amines was also investigated and evaluated at under 20 ppm after three runs.
Chrétien
Jean-Mathieu
JM
Laboratoire de Synthèse Organique, UMR CNRS 6513 and FR CNRS 2465, Faculté des Sciences et des Techniques, 2 rue de la Houssinière, BP 92208, F-44322 Nantes Cedex 3, France.
Zammattio
Françoise
F
Le Grognec
Erwan
E
Paris
Michaël
M
Cahingt
Blanche
B
Montavon
Gilles
G
Quintard
Jean-Paul
JP