2-alkenyl-3-aminothiophene derivative and a method for manufacturing the same

And to provide an industrially method for inexpensively producing a useful 2-alkenyl-3-aminothiophene derivatives as agrochemical intermediates. The present invention can be represented by the general formula (2) is represented by the 3-aminothiophene derivative or is reacted with a ketone of the general formula (1) without the use of a salt of the protecting group, the 3-aminothiophene derivative method for introducing the alkenyl group at the 2-position, and to useful 2-alkenyl-3-aminothiophene derivatives as agrochemical intermediates (3a) ~ (3d).