Relationship Between Structure of Conjugated Oxime Esters and Their Ability to Cleave DNA
摘要:
The size and geometry of polycycles are critical to intercalation into DNA. This work involves the establishment of a new compound library that includes 35 O-benzoyl oxime esters with intercalators of five types. These conjugated compounds were synthesized by the condensation of substituted benzoyl chlorides (XC6H4COCl; X = H, Me, CN, F, and NO2) or naphthoyl chlorides with oximes of fluoren-9-one, 9,10-anthraquinone, xanthen-9-one, thioxanthen-9-one, and 9H-thioxanthen-9-one, 10,10-dioxide to give the corresponding esters in 80-99% yields. All of these compounds could cleave DNA when photolyzed by UV light. Of these conjugates, 9,10-anthraquinone-O-9-(4-fluorobenzoyl)oxime with a binding constant of 4.49 x 10(4) M-1 cleaved DNA most efficiently. Examination of the structure activity relationship supports a conclusion that two factors affect DNA-cleaving potency. These are (1) the planarity of the intercalating moiety, and (2) the size and substituents of the benzoyl ring. The DNA-cleaving ability followed the order 9,10-anthraquinone > fluoren-9-one >= xanthen-9-one similar to thioxanthen-9-one > 9H-thioxanthen-9-one 10,10-dioxide. The benzoyl-containing oxime ester conjugates were more active than the corresponding naphthoyl-containing conjugates. The potency that was associated with the different substituents on the benzoyl ring followed the order F > CN >= NO2 > Me similar to H.
effected aromaticsubstitution on the solvent molecules by diphenylmethaniminyl radicals to give N-diphenylmethylenearylamines only when benzoxyl or p-chlorobenzoxyl radicals were generated concurrently. A mechanism involving a participation of the sufficiently long-lived acyloxyl radicals is proposed for the iminylation reaction on the basis of the reactivity patterns in this substitution reaction
Oxime esters of anthraquinone as photo-induced DNA-cleaving agents for single- and double-strand scissions
作者:Jih Ru Hwu、Shwu-Chen Tsay、Shih Chin Hong、Yi-Jing Leu、Chih-Fen Liu、Shang-Shing P Chou
DOI:10.1016/s0040-4039(03)00375-7
日期:2003.3
Anthraquinone-O-9-(4-cyanobenzoyl)oxime (13) with binding constant of 4.49x 10(4) M-1 exhibited single-strand scission of DNA at the concentration of 10 muM and double-strand scission at 50 muM upon UV irradiation. (C) 2003 Published by Elsevier Science Ltd.