A quaternary ammonium salt [H-dabco][AcO]: as a recyclable and highly efficient catalyst for the one-pot synthesis of β-phosphonomalonates
作者:Ya-Qin Yu、Da-Zhen Xu
DOI:10.1039/c5ra02743h
日期:——
A simple, green and highly efficient approach for the one-potthree-componentsynthesis of β-phosphonomalonates has been developed. In the presence of the quaternary ammonium salt catalysts, the β-phosphonomalonates were obtained in excellent yields within short times viatandem Knoevenagel–phospha-Michael reaction. The reaction of aldehydes/ketones, active methylene compounds, and diethyl phosphite
HClO4-SiO2 as a Novel and Recyclable Catalyst for the Phospha-Michael Addition of Phosphorous Nucleophiles to α,β-Unsaturated Malonates
作者:Sara Sobhani、Soodabeh Rezazadeh
DOI:10.1055/s-0029-1220069
日期:2010.6
An efficient synthesis of β-phosphono malonates via phospha-Michael addition of phosphorous nucleophiles to α,β-unsaturated malonates in the presence of HClO4-SiO2 as a new and recyclable catalyst is described.
A practical and highly efficient protocol for multicomponent synthesis of β-phosphonomalononitriles and 2-amino-4H-chromen-4-yl phosphonates using diethylamine as a novel organocatalyst
has been demonstrated for the first time to be a highly efficient organocatalyst in the solvent-free synthesis of β-phosphonomalononitriles by a three component condensation of aldehyde, malononitrile and dialkyl phosphite at ambient temperature. The applicability of the same catalyst in the synthesis of diethyl (2-amino-3-cyano-chromene-4-yl) phosphonic acid esters has also been described.
Diethylamine: A smart organocatalyst in eco-safe and diastereoselective synthesis of medicinally privileged 2-amino-4H-chromenes at ambient temperature
作者:Makarand A. Kulkarni、Kapil S. Pandit、Uday V. Desai、Uday P. Lad、Prakash P. Wadgaonkar
DOI:10.1016/j.crci.2013.02.016
日期:2013.8
Résumé Diethylamine has been demonstrated to be an efficient organocatalyst in the diastereoselective synthesis of Bcl-2 protein antagonist (HA-14-1) and of its structural analogues by one-pot condensation between salicylaldehyde and three different C–H acids, viz. ethyl cyanoacetate, phenylsulfonyl acetonitrile, and malononitrile. Easy commercial availability of the catalyst at extremely low cost and avoidance of conventional work-up as well as purification procedures qualifies this scalable protocol for a “near-ideal synthesis”. Supplementary Materials: Supplementary material for this article is supplied as a separate file: mmc1.docx
Lanthanum(<scp>iii</scp>) triflate supported on nanomagnetic γ-Fe<sub>2</sub>O<sub>3</sub>: a new magnetically recyclable heterogeneous Lewis acid for the one-pot synthesis of β-phosphonomalonates
作者:Sara Sobhani、Zahra Pakdin-Parizi
DOI:10.1039/c4ra00543k
日期:——
A new magnetically recyclable heterogeneous Lewis acid was synthesized and used for the one-pot synthesis of β-phosphonomalonates.