title: Synthesis and antitumor evaluation of novel benzo[d]pyrrolo[2,1-b]thiazole derivatives.
abstract: A series of novel 2,3-bis(hydroxymethyl)benzo[d]pyrrolo[2,1-b]thiazoles and their bis(alkylcarbamate) derivatives were synthesized starting from benzothiazole via reaction with dimethyl acetylenedicarboxylate (DMAD)/tetra-fluoro boric acid, catalytic hydrogenation, and alkylcarbamoylation. The anti-proliferative activity of these agents against human leukemia and various solid tumor cell growth in vitro was studied. The structure-activity relationship studies revealed that the bis(alkylcarbamates) derivatives are generally more cytotoxic than the corresponding bis(hydroxymethyl) congeners in inhibiting human lymphoblastic leukemia CCRF-CEM and various human solid tumor cell growth in culture. These agents have no cross-resistance to taxol or vinblastine. Studies on the therapeutic effect against human breast carcinoma MX-1 xenograft showed that complete tumor remission (CR) were achieved by treating with C1-4'-F- or C1-4'-Cl-Ph-bis(i-propylcarbamates) derivatives (19b and 19c, respectively) and more than 99% tumor suppression by the corresponding bis(ethylcarbamates) 18b and 18c at the maximal tolerated dose. Alkaline agarose gel shifting assay revealed that the newly synthesized compounds are able to induce DNA interstrand cross-linking. The present studies generated a series of new potent DNA interstrand cross-linking agents, which have potential for further antitumor drug development.
authors.affiliation: Institute of Biomedical Sciences, Academia Sinica, Taipei 11529, Taiwan.
authors.forename: Ravi
authors.initials: R
authors.lastname: Chaniyara
authors.forename: Satishkumar
authors.initials: S
authors.lastname: Tala
authors.forename: Chi-Wei
authors.initials: CW
authors.lastname: Chen
authors.forename: Pei-Chih
authors.initials: PC
authors.lastname: Lee
authors.forename: Rajesh
authors.initials: R
authors.lastname: Kakadiya
authors.forename: Huajin
authors.initials: H
authors.lastname: Dong
authors.forename: Bhavin
authors.initials: B
authors.lastname: Marvania
authors.forename: Ching-Huang
authors.initials: CH
authors.lastname: Chen
authors.forename: Ting-Chao
authors.initials: TC
authors.lastname: Chou
authors.forename: Te-Chang
authors.initials: TC
authors.lastname: Lee
authors.forename: Anamik
authors.initials: A
authors.lastname: Shah
authors.forename: Tsann-Long
authors.initials: TL
authors.lastname: Su
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology*; D002453:Cell Cycle / Q000187:drug effects; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D060326:Chemistry Techniques, Synthetic; D004247:DNA / Q000737:chemistry; D006801:Humans; D020128:Inhibitory Concentration 50; D008297:Male; D051379:Mice; D013844:Thiazoles / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology*; D023041:Xenograft Model Antitumor Assays
chemical_list: D000970:Antineoplastic Agents; D013844:Thiazoles; D004247:DNA