Document Type : Articles
Organic Chemistry Department, Faculty of Chemistry, Urmia University, Urmia, Iran
Chemistry Department, Faculty of Science, University of Sistan and Baluchestan, Zahedan, Iran
Synthesis of organic compounds using some natural compounds as catalysts has gained more attention in recent decades. With respect to the importance of these procedures, the synthesis of 3,4-dihydropyrano[2,3-c]chromene and pyrano[2,3-d]pyrimidine derivatives using vitamin B12 by a one-pot reaction of malononitrile, benzaldehydes and 4-hydroxycumarine or 1,3-dimethylbarbituric acid is reported.