| 摘要 |
Disclosed is a process for preparation of novel bis-dioxopiperazine derivatives represented by the following formula (I): ...(I) wherein R1 represents a lower alkyl group; R2 represents a hydrogen atom or a group of -CH2-O-?-R3; and R3 represents a lower alkyl group, a substituted or unsubstituted phenyl group, a substituted or unsubstituted furyl group, a substituted or unsubstituted styryl group or a group of -(CH2)n-R4, or -OR7 in which R4 represents a carboxyl group, a substituted or unsubstituted phenyl group or a substituted or unsubstituted phenoxy group, R5 and R6 respectively represent a hydrogen atom or a protective group for amino group, R7 represents a lower alkyl group or a substituted or unsubstituted benzyl group, and n is an integer and 1 or 2, a substituent for the phenyl group, the phenoxy group and the benzyl group being selected from the group consisting of a halogen atom, a lower alkyl group, a lower alkoxy group, a nitro group, an amino group and a cyano group, a substituent for the phenyl group, the furyl group and the styryl group being selected from the group consisting of a halogen atom, a lower alkyl group, a lower alkoxy group, a nitro group, an amino group and a cyano group. |
