Iodine mediated synthesis of coumarins from chromenes
摘要:
Iodine mediated rapid conversion of 2-amino-3-cyano-4-aryl-4H chromenes to the corresponding coumarins in the presence of water is described. Several chromenes are obtained in high yields without chromatographic purification. Under anhydrous conditions, 2-iminochromenes are obtained as major products. (C) 2015 Elsevier Ltd. All rights reserved.
Highly efficient conversion of fused 2-amino-4-aryl-4H-chromene-3-carbonitriles into fused 2-oxo-4-aryl-2H-chromene-3-carbonitriles using Vilsmeier conditions
作者:Janardhan Banothu、Ravibabu Velpula、Rajitha Gali、Rajitha Bavantula、Peter A. Crooks
DOI:10.1016/j.tetlet.2013.05.030
日期:2013.7
A simple, mild, and highly efficient protocol for the synthesis of fused 2-oxo-4-aryl-2H-chromene-3-carbonitriles has been developed starting from fused 2-amino-4-aryl-4H-chromene-3-carbonitriles utilizing Vilsmeier conditions. (C) 2013 Elsevier Ltd. All rights reserved.