Choline chloride based eutectic solvent for the efficient synthesis of 2-amino-4<i>H</i>-chromen-4-yl phosphonate derivatives via multicomponent reaction under mild conditions
ABSTRACT Synthesis of 2-amino-4H-chromen-4-ylphosphonate derivatives has been accomplished by the one-pot three-component reaction of salicylaldehyde, malononitrile/ethylcyanoacetate and dialkyl phosphites in the presence of reusable deep eutectic solvent (DES) undermildconditions. The advantages of this method are mildreactionconditions, simple work-up procedure, use of DES as a green solvent
摘要 水杨醛、丙二腈/氰基乙酸乙酯和亚磷酸二烷基酯在温和条件下,在可重复使用的低共熔溶剂 (DES) 存在下,通过一锅三组分反应合成了 2-氨基-4H-色烯-4-基膦酸酯衍生物. 该方法的优点是反应条件温和,后处理程序简单,使用 DES 作为绿色溶剂,是制备重要的生物活性含磷化合物的经济方案。图形概要
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
An efficient procedure for the preparation of 2-amino-3-cyano-4H-chromen-4-yl phosphonate derivatives via a three-component reaction of salicylaldehyde, malononitrile and trialkyl phosphites or diethyl phosphite using inexpensive and environmentally friendly imidazole as organocatalyst has been reported. Beside excellent yields and easy workup, the reaction is done in an almost neutral medium.
Synthesis of 2-amino-3-cyano-4H-chromen-4-ylphosphonates and 2-amino-4H-chromenes catalyzed by tetramethylguanidine
作者:Reddi Mohan Naidu Kalla、Seong Jin Byeon、Min Seon Heo、Il Kim
DOI:10.1016/j.tet.2013.10.052
日期:2013.12
Synthesis of 2-amino-4H-chromen-4-ylphosphonates and 2-amino-4H-chromenes has been accomplished by the reaction of salicylaldehyde, malononitrile, dialkyl/diphenylphosphites catalyzed by 1,1,3,3-tetramethylguanidine (TMG) under neat conditions at room temperature. The applicability of catalytic TMG for the synthesis of 2-amino-4H-chromenes also has been described. The mild reaction conditions, simple work-up procedure, and use of TMG as an inexpensive catalyst provides an economical protocol for the preparation of important phosphorus-containing compounds. (C) 2013 Elsevier Ltd. All rights reserved.
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