Thiourea dioxide in water as a recyclable catalyst for the synthesis of structurally diverse dihydropyrido[2,3-d]pyrimidine-2,4-diones
摘要:
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. (C) 2012 Elsevier Ltd. All rights reserved.
Solid supported synthesis of structurally diverse dihydropyrido[2,3-d]pyrimidines using microwave irradiation
作者:Anu Agarwal、Prem M.S. Chauhan
DOI:10.1016/j.tetlet.2004.12.109
日期:2005.2
We have synthesized a library of 16 dihydropyrido[2,3-d]pyrimidines in high yields (82-92%) on solid support using microwave irradiation. (C) 2004 Elsevier Ltd. All rights reserved.