Efficient and chemoselective N-acylation of 10-amino-7-ethyl camptothecin with poly(ethylene glycol).
A new poly(ethylene glycol) (PEG) conjugate of 10-amino-7-ethyl camptothecin, a potent antitumor analogue of camptothecin, has been synthesized and preliminary in vivo tests have been performed. Successful chemoselective N-acylation of 10-amino-7-ethyl camptothecin was accomplished using phenyl dichlorophosphate, a coupling reagent used in esterification of alcohols, while other coupling methods failed, due to the low nucleophilicity of the amino group in position 10. The conjugate was tested against P388 murine leukemia cell lines and resulted equipotent to CPT-11, a camptothecin analogue already in clinical use.
Guiotto
Andrea
A
Department of Pharmaceutical Sciences, University of Padova - via F Marzolo, 5 35131 Padova, Italy. andrea.guiotto@unipd.it
Canevari
Mirta
M
Orsolini
Piero
P
Lavanchy
Olivier
O
Deuschel
Christine
C
Kaneda
Norimasa
N
Kurita
Akinobu
A
Matsuzaki
Takeshi
T
Yaegashi
Takeshi
T
Sawada
Seigo
S
Veronese
Francesco M
FM
D000215:Acylation; D002166:Camptothecin / Q000031:analogs & derivatives* / Q000737:chemistry* / Q000378:metabolism*; D011092:Polyethylene Glycols / Q000737:chemistry* / Q000378:metabolism*; D013237:Stereoisomerism
D011092:Polyethylene Glycols; D002166:Camptothecin