FeCl<sub>3</sub>-Mediated Arylation of α-Hydroxyphosphonates with Unactivated Arenes: Pseudo-Umpolung in Allylic Phosphonates
作者:Gangaram Pallikonda、Manab Chakravarty
DOI:10.1002/ejoc.201201352
日期:2013.2
An FeCl3-mediated regio- and stereoselective Friedel–Crafts-type arylation of α-hydroxy phosphonates with unactivatedarenes has been developed in which the unstable allylphosphonate cations generated are stabilized by extended conjugation. The approach provides a simple, efficient and economic approach to highly demanding stereoselective γ-aryl-substituted vinylphosphonates and dialkyl (diarylmethyl)phosphonates
obtained in excellent yield and regioselectivity by direct and clean synthetic protocol that involves FeCl3 or triflic acid (TfOH) mediated arylation reactions of easily accessible (hydroxy)-1-naphthylmethylphosphonate with activated as well as unactivatedarenes including halogenated anisoles, biphenyl, naphthalene and pyrene (extended π-systems) at room temperature.