Ultrasonic irradiation of the ullmann condensation: Application to the preparation of dioxolo, dioxino, cyclopent, and imidazolo anthranilic acid derivatives
The synthesis of N-aryl anthranilicacid derivatives bearing dioxolo, dioxino, cyclopent, and imidazolo supplementary ring systems is reported. The Ullmann-Goldberg condensation of the N-aryl anthranilicacid is improved in yield and reaction time, compared to conventional heating; by ultrasonic irradiation.
Synthesis and biological evaluation of modified acridines: the effect of N- and O- substituent in the nitrogenated ring on antitumor activity
作者:Isabel Sánchez、Rosa Reches、Daniel Henry Caignard、Pierre Renard、Maria Dolors Pujol
DOI:10.1016/j.ejmech.2005.11.006
日期:2006.3
A series of new acridines has been prepared by cyclodehydration of N-(2,3-dihydro-1,4-berizodioxin-6-yl)anthranilic acid in acidic media following classical procedures. All these compounds have in common a dioxygenated ring fused to the acridine. The tetracyclic system possesses a linear or angular structure formed by intramolecular cyclisation. The last ring and the substituent of the system modify, in an interesting way, the antitumor activity of acridines. Several of the studied compounds displayed significant cytotoxic activity (inhibition of L 12 10 and HT-29 cell proliferation). The most cytotoxic compound 13a, shows more activity than m-AMSA in inhibiting L1210 and HT-29 cell proliferation and this compound has been selected as a development candidate for further evaluation. The activity results also indicate that the new 11-O-substituted compounds are of considerable interest with high levels of cytotoxic activity. The angular or non-linear dioxinoacridine 10 was equiactive with the linear structure 7. Pentacyclic analogues (14 and 15) were more cytotoxic than the tetracyclic compounds (up to twofold). (c) 2006 Elsevier SAS. All rights reserved.
Synthesis of New N-Alkyl- and N-Acyldioxinophenothiazine and Acridinone Derivatives
作者:Gérard Boyer、Florence Chatel、Sandrine Morel、Jean Pierre Galy