Patent ID: 8153823

Claim:
A process for producing a 2-alkenyl-3-aminothiophene derivative of formulae (3a) to (3d) or a mixture thereof, in which a ketone derivative of formula (1) is reacted with a 3-aminothiophene derivative of formula (2) in the presence of an acid catalyst, wherein, in the formula, R1, R2, R3 and R4 each independently represent a hydrogen atom, an alkyl group having 1 to 12 carbon atoms or an alkenyl group having 1 to 12 carbon atoms; at least one of R1, R2, R3 and R4 is an alkyl group having 1 to 12 carbon atoms or an alkenyl group having 1 to 12 carbon atoms; and R1 and R2, R1 and R3, R1 and R4, R2 and R3, R2 and R4, or R3 and R4 may be bonded with each other to form a cycloalkyl group, wherein, in the formula, R5 and R6 each independently represent a hydrogen atom, a halogen atom, a cyano group, a nitro group, an alkyl group having 1 to 12 carbon atoms, an alkenyl group having 1 to 12 carbon atoms, an alkynyl group having 1 to 12 carbon atoms, a phenyl group, a hetero ring, an alkoxy group having 1 to 12 carbon atoms or an alkylthio group having 1 to 12 carbon atoms; and R5 and R6 may be bonded with each other to form a cycloalkyl group,