Patent ID: 8455659

Claim:
A method for manufacturing a compound represented by the following formula (7): wherein R 3 represents a C 1 -C 6 alkyl group, and R 4 and R 5 , independently from each other, represent a hydrogen atom, a C 1 -C 6 alkyl group or a phenyl group, or R 4 and R 5 together form a tetramethylene group, a pentamethylene group or an oxo group, comprising: reacting a compound represented by the following formula (4): wherein R 3 represents a C 1 -C 6 alkyl group, with a compound represented by the following formula (5): wherein R 4 and R 5 , independently from each other, represent a hydrogen atom, a C 1 -C 6 alkyl group or a phenyl group, or R 4 and R 5 together form a tetramethylene group, a pentamethylene group or an oxo group, and R 6 represents a C 1 -C 6 alkyl group, or with a compound represented by the following formula (6): wherein R 4 and R 5 , independently from each other, represent a hydrogen atom, a C 1 -C 6 alkyl group or a phenyl group, or R 4 and R 5 together form a tetramethylene group or a pentamethylene group, except that R 4 and R 5 in the compound of the formula (7) do not together form an oxo group when the compound of the formula (6) is used.