Neihumicin, a new cytotoxic antibiotic from Micromonospora neihuensis. III. Structure-activity relationships.
Structure-cytotoxicity relationships studies have indicated that the C-3 and C-6 disubstituted piperazine-2,5-diones are structurally required for significant cytotoxicity, and the neihumicin-like C-3 and C-6 disubstituted unsymmetrical piperazine derivatives are, in general, more cytotoxic than the corresponding symmetrical piperazine-2,5-diones. Several synthetic analogs including 3,6-di-(2,4,5-trimethoxybenzylidene)piperazine-2,5- dione, 3,6-dibenzylidene-2-ethoxy-3,6-dihydropyrazine-5-one, 3-benzylidene-6-(m-chlorobenzylidene)-2-methoxy-3,6-dihydropyrazine++ +-5-one, have been shown to be more cytotoxic than neihumicin.
Yokoi
T
T
Natural Products Laboratory, School of Pharmacy, University of North Carolina, Chapel Hill 27514.
Yang
L M
LM
Yokoi
T
T
Wu
R Y
RY
Lee
K H
KH
D000903:Antibiotics, Antineoplastic / Q000138:chemical synthesis* / Q000494:pharmacology; D011719:Pyrazines / Q000138:chemical synthesis / Q000494:pharmacology; D013329:Structure-Activity Relationship
D000903:Antibiotics, Antineoplastic; D011719:Pyrazines; C056028:neihumicin