Heterocycles with a β-nitroenamine fragment 1.: Synthesis of 2-amino-3-nitropyrans from nitroacetonitrile.: Crystal and molecular structure of 2-amino-4-(4-fluorophenyl)-3-nitro-7,7-dimethyl-5,6,7,8-tetrahydrochromen-5(4H)-one

Reactions of dimedone and dihydroresorcinol with arylidenenitroacetonitriles yield fused 2-amino-3-nitropyrans. The crystal and molecular structure of one of the reaction products was determined by X-ray diffraction analysis.