1333490-07-5Relevant articles and documents
Nano-Fe3O4 encapsulated-silica particles bearing sulfonic acid groups as a magnetically separable catalyst for green and efficient synthesis of functionalized pyrimido[4,5-b]quinolines and indeno fused pyrido[2,3-d]pyrimidines in water
Nemati, Firouzeh,Saeedirad, Raheleh
, p. 370 - 372 (2013)
The magnetic nanoparticles supported silica sulfuric acid was used as an efficient catalyst for the synthesis of pyrimido[4,5-b]quinolines and indeno fused pyrido[2,3-d]pyrimidines in water. The desired products were obtained in excellent yields. Fe3O4@SiO2-SO3H was readily recovered using an external magnet and could be reused several times without significant loss of reactivity.
Thiourea dioxide in water as a recyclable catalyst for the synthesis of structurally diverse dihydropyrido[2,3-d]pyrimidine-2,4-diones
Verma, Sanny,Jain, Suman L.
experimental part, p. 2595 - 2600 (2012/07/14)
A series of dihydropyrido[2,3-d]pyrimidine-2,4-diones derivatives were synthesized by the three-component reaction of 6-amino-1,3-dimethyl uracil, aromatic aldehydes, and 1,3-dicarbonyl compound catalyzed by thiourea dioxide in aqueous media. Importantly, the aqueous layer containing thiourea dioxide could be reused for several runs without significant loss in catalytic activity. This method provided several advantages such as inexpensive, recyclable catalyst, easier work-up, milder reaction conditions and environmental benign nature.
