An enamine compound represented by general formula in the formula: R 1 represents an electron-withdrawing group; A represents a divalent aromatic hydrocarbon group which may contain a substituent, a divalent aromatic heterocyclic group which may contain a substituent or a divalent unsaturated aliphatic hydrocarbon group which may contain a substituent; R 2 represents a hydrogen atom or a hydrocarbon group which may contain a substituent; R 3 and R 4 are the same or different from each other and represent an aromatic hydrocarbon group which may contain a substituent or an aromatic heterocyclic group which may contain a substituent, or R 3 and R 4 together form an optionally substituted bicyclic aromatic heterocyclic group containing two or more nitrogen atoms or a nitrogen atom and an oxygen atom or a sulfur atom, or a tricyclic aromatic heterocyclic group which may contain a substituent; and R 2 and A, or R 2 and R 3 may together form a cyclic structure, and R 1 represents a group selected from a cyano group, a hydrocarbon oxycarbonyl group, a carboxamide group which may contain a substituent, a dicyanoethenyl group, a Lewis acid residue, an aromatic heterocyclic group, and a group represented by -A 1 -C(R 5)=CH-N(R 6)(R 7), wherein A 1 represents a single bond, a divalent aromatic hydrocarbon group which may contain a substituent, a divalent aromatic heterocyclic group which may contain a substituent or a divalent unsaturated aliphatic hydrocarbon group which may contain a substituent, R 5 represents a hydrogen atom or a hydrocarbon group which may contain a substituent, R 6 and R 7 are the same or different from each other and represent an aromatic hydrocarbon group which may contain a substituent or an aromatic heterocyclic group which may contain a substituent, or R 6 and R 7 together form a bicyclic aromatic heterocyclic group which may contain a substituent and contains two or more nitrogen atoms or a nitrogen atom and an oxygen atom or a sulfur atom, or a tricyclic aromatic heterocyclic group which may contain a substituent, and R 5 and A 1, or R 5 and R 6 may together form a cyclic structure. R 1 represents an electron-withdrawing group; A represents a divalent aromatic hydrocarbon group which may contain a substituent, a divalent aromatic heterocyclic group which may contain a substituent or a divalent unsaturated aliphatic hydrocarbon group which may contain a substituent; R 2 represents a hydrogen atom or a hydrocarbon group which may contain a substituent; R 3 and R 4 are the same or different from each other and represent an aromatic hydrocarbon group which may contain a substituent or an aromatic heterocyclic group which may contain a substituent, or R 3 and R 4 together form an optionally substituted bicyclic aromatic heterocyclic group containing two or more nitrogen atoms or a nitrogen atom and an oxygen atom or a sulfur atom, or a tricyclic aromatic heterocyclic group which may contain a substituent; and R 2 and A, or R 2 and R 3 may together form a cyclic structure, and R 1 represents a group selected from a cyano group, a hydrocarbon oxycarbonyl group, a carboxamide group which may contain a substituent, a dicyanoethenyl group, a Lewis acid residue, an aromatic heterocyclic group, and a group represented by -A 1 -C(R 5)=CH-N(R 6)(R 7), wherein A 1 represents a single bond, a divalent aromatic hydrocarbon group which may contain a substituent, a divalent aromatic heterocyclic group which may contain a substituent or a divalent unsaturated aliphatic hydrocarbon group which may contain a substituent, R 5 represents a hydrogen atom or a hydrocarbon group which may contain a substituent, R 6 and R 7 are the same or different from each other and represent an aromatic hydrocarbon group which may contain a substituent or an aromatic heterocyclic group which may contain a substituent, or R 6 and R 7 together form a bicyclic aromatic heterocyclic group which may contain a substituent and contains two or more nitrogen atoms or a nitrogen atom and an oxygen atom or a sulfur atom, or a tricyclic aromatic heterocyclic group which may contain a substituent, and R 5 and A 1, or R 5 and R 6 may together form a cyclic structure.