Patent ID: 8367846

Claim:
A method of producing a 2-alkyl-3-aminothiophene derivative represented by Formula (4), the method comprising (A) oxidizing a compound represented by Formula (1) to produce a compound represented by Formula (3), and (B) reducing the compound represented by Formula (3): wherein, in Formula (1), R represents a substituent represented by the following Formula (6): wherein, in Formula (6), R 1 represents a hydrogen atom, or a straight-chain or branched alkyl group having 1 to 6 carbon atoms and # represents a site of bonding with the compound represented by Formula (1); and X represents a hydroxy group, a halogen atom or a substituent represented by the following Formula (2): #-O-A(O) n -Q (2) wherein, in Formula (2), A represents a carbon atom or a sulfur atom; n is 1 when A is a carbon atom, and is 1 or 2 when A is a sulfur atom; Q represents an alkyl group having 1 to 10 carbon atoms, a cycloalkyl group having 3 to 10 carbon atoms, a haloalkyl group having 1 to 10 carbon atoms, a hydrocarbyloxy group having 1 to 10 carbon atoms, or an aryl group that may be substituted by an alkyl group having 1 to 6 carbon atoms; and # represents a site of bonding with the compound represented by Formula (1): wherein, in Formula (3), R is the same as in Formula (1): wherein, in Formula (4), R is the same as in Formula (1).