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
Simple, Efficient, and Catalyst-Free Synthesis of (2-Amino-4H-1-benzopyran-4-yl)phosphonates in Polyethylene Glycol
Several (2‐amino‐4H‐1‐benzopyran‐4‐yl)phosphonates were efficiently synthesized by employing a multicomponent protocol involving a salicylaldehyde, malononitrile or ethyl cyanoacetate, and a trialkyl phosphite in polyethyleneglycol. The latter could be recovered and re‐used. No additional solvent or catalyst was required. To the best of our knowledge, this is the first report of the one‐pot preparation
通过使用涉及水杨醛,丙二腈或氰基乙酸乙酯的多组分方案以及聚乙二醇中的亚磷酸三烷基酯,可以有效地合成几种(2-氨基-4- H -1-苯并吡喃-4-基)膦酸酯。后者可以回收再利用。不需要额外的溶剂或催化剂。据我们所知,这是一次单罐制备(2-氨基-4 H -1-苯并吡喃-4-基)膦酸二甲酯的报告。
Solvent- and Catalyst-free Synthesis of (2-Amino-3-cyano-4H-chromen-4-yl) Phosphonates
protocol is a multicomponent reaction (MCR). A number of MCRs have been developed for the preparation of libraries of privileged structures.10–16 Amongst three-component syntheses, the generation of (2-amino-3-cyano-4H-chromen-4-yl) phosphonates is considered a prominent protocol owing to the incorporation of a phosphorus atom in the molecule.17,18 A number of reactions catalyzed by Brønsted base,19–21
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.
A simple and efficient one pot synthesis of 2-amino-4H-chromen-4-yl phosphonate derivatives has been accomplished by the condensation of salicylaldehyde, malononitrile/ethylcyanoacetate and triethyl phosphite/trimethyl phosphite in the presence of molecular iodine as catalyst in water at room temperature. All the reactions were very clean and the products were obtained in very good to excellent yields. The title compounds are characterized by IR, 1H-, 13C-, 31P-NMR and mass spectra, also studied their antimicrobial and antioxidant activity.