The crystal structure and unclassical pyran conformation of 2-amino-7-methyl-4-(3-nitrophenyl)-5-oxo-4H,5H-pyran [4,3-b]pyran-3-carbonitrile

摘要

The X-ray crystal structure of 2-amino-7-methyl-4-(3-nitrophenyl)-5-oxo-4H,5H-pyrano[4,3-b]pyrano-3- carbonitrile 1, is determined. It is interesting that all the atoms of the pyran ring are coplanar, which is different from that of other similar compounds. The structure is stabilised by intermolecular hydrogen bonds. The structure of the product is also characterised by IR, NMR spectra and elemental analysis.