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.
Inorganic base catalyzed synthesis of (2-amino-3-cyano-4H-chromene-4-yl) phosphonate derivatives via multi-component reaction under mild and efficient conditions
Various phosphonate derivatives were synthesized in good to excellent yields by condensation of substituted salicylaldehydes, malononitrile and phosphites using anhydrous LiOH as a catalyst under mild conditions.
5-Hydroxypentylammonium acetate as a reusable ionic liquid catalyzes tandem Knoevenagel-phospha-Michael reaction of aldehydes, malononitrile and phosphites
作者:S. Sobhani、M. Honarmand
DOI:10.1007/s13738-012-0088-1
日期:2012.10
5-Hydroxypentylammonium acetate as a task-specific ionic liquid promotes efficient tandem Knoevenagel-phospha-Michael reaction of phosphite esters with aryl/heteroaryl/alkyl/salicylaldehydes and malonitrile/ethyl cyanoacetate at room temperature in short reaction times. This simple procedure allows a series of β-phosphonomalonates and 4-substituted 2-amino-4H-chromenes with phosphonic acid dialkyl esters to be synthesized in good to high yields in the presence of an ionic liquid for the first time.
Synthesis of 2-amino-4H-chromen-4-ylphosphonates and β-phosphonomalonates via tandem Knoevenagel–Phospha-Michael reaction and antimicrobial evaluation of newly synthesized β-phosphonomalonates
作者:Parteek Kour、Anil Kumar、Rashmi Sharma、Reena Chib、Inshad Ali Khan、Vijai K. Rai
DOI:10.1007/s11164-017-3077-2
日期:2017.12
demonstrated a new approach for the synthesis of 2-amino-4 H -chromen-4-ylphosphonates and β -phosphonomalonates linked 2-chloroquinoline-3-carbaldehyde by modified one-pot three-component tandem Knoevenagel–Phospha-Michael reaction of salicylaldehyde/aryl aldehyde/2-chloroquinoline-3-carbaldehyde, malononitrile/ethylcyanoacetate, and phosphite ester using triethylamine (1–10 mol%) in ethanol under reflux conditions
Aqueous microwave-assisted DMAP catalyzed synthesis of β-phosphonomalonates and 2-amino-4H-chromen-4-ylphosphonates via a domino Knoevenagel-phospha-Michael reaction
作者:Parteek Kour、Anil Kumar、Vijai K. Rai
DOI:10.1016/j.crci.2016.05.013
日期:2017.2
Résumé An aqueous microwave (mw)-assisted DMAP catalyzed one-pot highly efficient route to synthesize β-phosphonomalonates and 2-amino-4H-chromen-4-yl phosphonates has been demonstrated via the domino Knoevenagel-phospha-Michael reaction of aryl aldehyde/salicylaldehyde, malononitrile/ethyl cyanoacetate and alkyl phosphite ester. Optimization of reaction conditions were performed by using conventional and microwave synthetic approaches. This conversion proceeded smoothly to deliver the desired product in good to excellent yields (75–95%) in a short reaction time (10–12 min). The present methodology is very simple, environmentally benign, high yielding and has very well demonstrated the synergistic effect of water and microwaves. Supplementary Materials: Supplementary material for this article is supplied as a separate file: mmc1.docx