Silica gel supported aluminum chloride (SiO2-AlCl3) and cross-linked polystyrene-supported aluminum chloride (PS-AlCl3) are environment- friendly heterogeneouscatalysts for the condensation of amines and aldehydes with diethyl phosphite to afford α-aminophosphonates. These solid acid catalysts are stable (as bench top catalysts) and can be easily recovered and reused without appreciable change in
Commercially available titanocene dichloride was firstly used as an extremely efficient catalyst for a three component one-pot reaction of an amine, an aldehyde (ketone), and a dialkyl phosphite to form α-aminophosphonates under solvent-free conditions at ambient temperature in good to high yields, providing a green, rapid and convenient method for the synthesis of α-aminophosphonates.
Zinc oxide nanoparticles (ZnO NPs, ca. 22 nm) were used as an effective catalyst in the solvent-free, three-component couplings of aldehydes, aromatic amines and dialkyl phosphites at room temperature to produce various α-amino phosphonates. Compared to known methods, satisfactory results were obtained with high yields through a simple experimental procedure. The catalyst was recycled and reused five times with minor decrease in its catalytic activity.
Benzimidazolium dicationic ionic liquid as an efficient and reusable catalyst for the synthesis of α-aminophosphonates and bis (α-aminophosphonates) under solvent-free condition
Benzimidazolium based on dicationic acidic ionicliquid (AIL) is designed, synthesized, and successfully used as a catalyst for the one-potsynthesis of α-aminophosphonates derivatives. The application of this AIL is studied in a new one-pot method for the synthesis of α-aminophosphonates derivatives under solvent-free conditions. The advantages of this method are the reusability of catalyst, high conversion
图形摘要摘要 基于双阳离子酸性离子液体(AIL)的苯并咪唑鎓被设计、合成并成功用作一锅合成α-氨基膦酸酯衍生物的催化剂。在无溶剂条件下合成 α-氨基膦酸酯衍生物的新一锅法中研究了该 AIL 的应用。该方法的优点是催化剂可重复使用、转化率高、反应时间短、实验步骤简单。
An efficient synthesis of α-Amino phosphonates using silica sulfuric acid as a heterogeneous catalyst