Hydrophosphorylation of Imines
Catalyzed by Tosyl Chloride for the Synthesis of α-Aminophosphonates
作者:Babak Kaboudin、Elaheh Jafari
DOI:10.1055/s-2008-1078509
日期:——
A simple, efficient, and general method has been developed for the synthesis of α-aminophosphonic esters using TsCl as an efficient catalyst. α-Aminophosphonic acids were obtained in good to high yields (65-85%) and purity under mild conditions by the reaction of diethyl phosphite with imines in the presence of TsCl.
choline-based ionicliquid [Ch-OSO3H] was prepared and used as a novel catalyst for the synthesis of α-aminophosphonates via a one-potthree-componentreaction with aldehydes, amines, and triethyl phosphite/diethyl phosphite at room temperature under solvent-free conditions or in aqueous media. The reaction was completed in short times and products could be simply separated from the reaction mixture in
A Green Approach to the Synthesis of α-Amino Phosphonate in Water Medium: Carbene Insertion into the N–H Bond by Cu(I) Catalyst
作者:Kankanala Ramakrishna、Jisha Mary Thomas、Chinnappan Sivasankar
DOI:10.1021/acs.joc.6b01940
日期:2016.10.21
achieved via phosphonate substituted carbeneinsertion into the N–H bond of aniline catalyzed by readily available copper salt under mild reaction conditions in water. In order to find an efficient catalyst for carbeneinsertion reaction in neat water, a large number of transition metal catalysts were screened, and we found that the [Cu(CH3CN)4]ClO4 was the best catalyst under employed reaction conditions
Silica gel supported aluminum chloride (SiO2-AlCl3) and cross-linked polystyrene-supported aluminum chloride (PS-AlCl3) are environment- friendly heterogeneouscatalysts for the condensation of amines and aldehydes with diethyl phosphite to afford α-aminophosphonates. These solid acid catalysts are stable (as bench top catalysts) and can be easily recovered and reused without appreciable change in