Reaction between triphenylphosphine and aromatic amines in the presence of diethyl azodicarboxylate: an efficient synthesis of aryliminophosphoranes under neutral and mild conditions
作者:Mehdi Adib、Ehsan Sheikhi、Azadeh Deljoush
DOI:10.1016/j.tet.2011.03.097
日期:2011.6
An efficient synthesis of aryliminophosphoranes is described. A mixture of an aromatic amine, diethylazodicarboxylate and triphenylphosphine undergo a Mitsonobu type reaction at ambient temperature in dry dichloromethane to afford aryliminophosphoranes in excellent yields.
Crystalline phosphorus ylides are obtained in excellent yields from the 1:1:1 addition reaction between triphenylphosphine, dimethylacetylenedicarboxylate and 2-aminothiazoles, such as 2-aminothiazole, 2-amino-3-methylthiazole, 2-aminothiazoline, 2-aminobenzothiazole, or 2-amino-7-methylbenzothiazole. These stabilized phosphoranes undergo a smooth intramolecular reaction in boiling toluene to produce the