Patent ID: 11945882
Assignee: DAIICHI SANKYO COMPANY, LIMITED
Field: Pharmaceuticals (Chemistry)
Classification: CPC C  A  Y | IPC C

Claim 7:
8. The production method according to claim 3, wherein the compound represented by the formula (1) is produced by a production method (I),
wherein the production method (I) is a production method comprising the steps of:
deprotecting protecting groups for an amino group and a carboxy group of a compound represented by formula (B):, wherein R1 represents an amino group protected with a protecting group, and R2 represents a carboxy group protected with a protecting group, to convert it into the compound represented by formula (8):, then
condensing the compound represented by the formula (8) with a compound represented by formula (C):, wherein X represents an active ester group or a carboxy group, to convert it into the compound represented by formula (10):, and then
condensing the compound represented by the formula (10) with the compound represented by formula (11):, to convert it into the compound represented by the formula (1):,