A CONVENIENT AND MILD PROCEDURE FOR THE PREPARATION OF α-KETO PHOSPHONATES OF 1-HYDROXYPHOSPHONATES UNDER SOLVENT-FREE CONDITIONS USING MICROWAVE
摘要:
The Reactions of 1-hydroxyphosphonates on the alumina-supported CrO3 are accelerated by microwave irradiation under solvent-free conditions to afford a high yielding synthesis of alpha -keto phosphonates.
Magnesium triflate [Mg(OTf)2] a highly stable, non-hygroscopic and a recyclable catalyst for the high yielding preparation of diethyl α-trimethylsilyloxyphosphonates from diethyl α-hydroxyphosphonates by HMDS under solventless conditions
and convenient procedure for the easy conversion of various α-hydroxyphosphonates to α-trimethylsilyloxyphosphonates under mild conditions with HMDS in the presence of a catalytic amount of magnesium triflate as a highly stable and a non-hygroscopic recyclable catalyst in neat conditions is described. In order to show the general applicability of this method, we have also applied this procedure successfully
Aluminium Triflate [Al(OTf)<sub>3</sub>] as a Recyclable Catalyst for the Conversion of α-Hydroxyphosphonates, Alcohols and Phenols to Their Corresponding O-Silylated Products with Hexamethyldisilazane (HMDS)
Al(OTf)3 as a recyclable catalyst conducts the efficient conversion of various types of α-hydroxyphosphonates to their corresponding α-trimethysilyloxyphosphonates with HMDS in the absence of solvent at room temperature. The general applicability of the catalyst under solvent-free conditions is demonstrated by applying it for the successful silylation of alcohols and phenols with HMDS in high yields.
A high-yielding and convenient procedure for the efficient conversion of α-hydroxyphosphonates to α-acetyloxyphosphonates using acetic anhydride in the presence of catalytic amounts of copper triflate is described.
A convenient and eco-friendly procedure is described for the efficient preparation of a variety of α-acetyloxyphosphonates from their corresponding α-hydroxyphosphonates using acetic anhydride under microwave irradiation in the absence of solvent.
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