Patent ID: 7977496

Claim:
A process for producing nitroguanidine derivatives represented by the following general formula (3) or a salt thereof, in which nitroisourea derivatives represented by the following general formula (1) or a salt thereof and compounds represented by the following general formula (2) or a salt thereof are reacted in the presence of a base in an aqueous solution wherein an inorganic salt is dissolved at not less than 50% of its saturated solubility, wherein, in the formula, R 1 represents an alkyl group having 1 to 4 carbon atoms; R 2 represents an alkyl group having 1 to 4 carbon atoms; and R 3 represents a hydrogen atom, wherein, in the formula, R 4 , R 5 and R 6 represent a hydrogen atom; and Q represents a pyridyl group which may be substituted with a halogen atom, a thiazolyl group which may be substituted with a halogen atom, or a tetrahydrofuryl group, wherein, in the formula, R 2 represents an alkyl group having 1 to 4 carbon atoms; R 3 , R 4 , R 5 and R 6 represent a hydrogen atom; and Q represents a pyridyl group which may be substituted with a halogen atom, a thiazolyl group which may be substituted with a halogen atom, or a tetrahydrofuryl group.