Patent ID: 8026363

Claim:
A process for producing a compound represented by formula (3): wherein, R 1 represents an alkyl having 1 to 3 carbon atoms or an arylalkyl having 7 to 10 carbon atoms, R 3 represents (i) an alkyl having 1 to 7 carbon atoms which may optionally be substituted with an alicyclic group, (ii) an alicyclic group or (iii) an arylalkyl having 7 to 10 carbon atoms, and, R 4 represents an alkyl having 1 to 3 carbon atoms or an arylalkyl having 7 to 10 carbon atoms, which comprises reacting a compound represented by formula (1): wherein R 1 and R 3 are as defined above, and, R 2 is amino with a compound represented by formula (2): wherein X is a splitting-off group and R 4 is as defined above.