{"DOI":"10.1515/znb-2007-0518","abstract":"Abstract\n\t\t\t\t Water has been used efficiently as a solvent for the reaction of barbituric acid, aldehyde and urea or thiourea to yield pyrimido[4,5-d]pyrimidines. This environmentally benign procedure leads to high yields of products of greater purity in a single step using water.","author":[{"family":"Kidwai"},{"family":"Singhal"},{"family":"Kukreja"}],"id":"unknown","issued":{"date-parts":[[2007,5,1]]},"page-first":"732","publisher":"Walter de Gruyter GmbH","title":"One-pot Green Synthesis for Pyrimido[4,5-d]pyrimidine Derivatives","type":"article-journal","volume":"62"}