本文描述了一种简单、温和且高效的连续 KO t Bu/FeCl 3催化的叔酰胺还原膦酰化。该过程首先涉及通过 TMDS(1,1,3,3-四甲基二硅氧烷)将叔酰胺选择性半还原为半缩醛胺中间体,然后是 FeCl 3催化将半缩胺醛中间体亲核加成膦酸酯,其中允许以中等到良好的收率直接合成 α-氨基膦酸酯。该方法适用于不含强酸性α-氢的酰胺和内酰胺,并且可以耐受各种官能团,包括甲氧基、甲硫基、氰基、卤素和杂环。
Abstract A supported acidic catalyst was easily prepared via anchoring imidazolium salt-based ionicliquid onto multiwalled carbon nanotube by covalent bonds. This novel immobilized acidic ionicliquid effectively catalyzed the one-pot synthesis of α-aminophosphonates from the reaction of amines and aldehydes with diethyl phosphite. The catalyst can be easily recovered and reused without appreciable
Copper-Catalyzed α-Amination of Phosphonates and Phosphine Oxides: A Direct Approach to α-Amino Phosphonic Acids and Derivatives
作者:Stacey L. McDonald、Qiu Wang
DOI:10.1002/anie.201308890
日期:2014.2.10
A direct approach to important α‐amino phosphonic acids and its derivatives has been developed by using copper‐catalyzed electrophilic amination of α‐phosphonate zincates with O‐acyl hydroxylamines. This amination provides the first example of CN bond formation which directly introduces acyclic and cyclic amines to the α‐position of phosphonates in one step. The reaction is readily promoted at room
Efficient solvent free synthesis of tertiary α-aminophosphonates using H<sub>2</sub>Ti<sub>3</sub>O<sub>7</sub>nanotubes as a reusable solid-acid catalyst
作者:Bhoomireddy Rajendra Prasad Reddy、Peddiahgari Vasu Govardhana Reddy、Bijivemula N. Reddy
DOI:10.1039/c5nj01914a
日期:——
The Kabachnik–Fields reaction was applied for the synthesis of α-aminophosphonates from aldehydes, secondary amines and dialkyl phosphites in the presence of H2Ti3O7nanotubes as reusable solid-acid catalysts.
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
Synthesis of tertiary α-amino phosphonate by one-pot three-component coupling mediated by LPDE
作者:Najmedin Azizi、Mohammad R. Saidi
DOI:10.1016/s0040-4020(03)00759-2
日期:2003.7
A very mild, efficient and simple method for the synthesis of tertiary α-amino phosphonates is reported by reaction of an aldehyde, a secondary amine and trialkylphosphite in ethereal solution of lithium perchlorate, LPDE, at ambient temperature with high yields.