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.
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