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Discovery of 3-phenyl-1H-5-pyrazolylamine derivatives containing a urea pharmacophore as potent and efficacious inhibitors of FMS-like tyrosine kinase-3 (FLT3).
MedLine Citation:
PMID:  23618709     Owner:  NLM     Status:  Publisher    
Preclinical investigations and early clinical trials suggest that FLT3 inhibitors are a viable therapy for acute myeloid leukemia. However, early clinical data have been underwhelming due to incomplete inhibition of FLT3. We have developed 3-phenyl-1H-5-pyrazolylamine as an efficient template for kinase inhibitors. Structure-activity relationships led to the discovery of sulfonamide, carbamate and urea series of FLT3 inhibitors. Previous studies showed that the sulfonamide 4 and carbamate 5 series were potent and selective FLT3 inhibitors with good in vivo efficacy. Herein, we describe the urea series, which we found to be potent inhibitors of FLT3 and VEGFR2. Some inhibited growth of FLT3-mutated MOLM-13 cells more strongly than the FLT3 inhibitors sorafenib (2) and ABT-869 (3). In preliminary in vivo toxicity studies of the four most active compounds, 10f was found to be the least toxic. A further in vivo efficacy study demonstrated that 10f achieved complete tumor regression in a higher proportion of MOLM-13 xenograft mice than 4 and 5 (70% vs 10% and 40%). These results show that compound 10f possesses improved pharmacologic and selectivity profiles and could be more effective than previously disclosed FLT3 inhibitors in the treatment of acute myeloid leukemia.
Wen-Hsing Lin; John T-A Hsu; Shu-Yi Hsieh; Chiung-Tong Chen; Jen-Shin Song; Shih-Chieh Yen; Tsu Hsu; Cheng-Tai Lu; Chun-Hwa Chen; Ling-Hui Chou; Yung-Ning Yang; Ching-Hui Chiu; Ching-Ping Chen; Ya-Ju Tseng; Kuei-Jung Yen; Ching-Fang Yeh; Yu-Sheng Chao; Teng-Kuang Yeh; Weir-Torn Jiaang
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-4-6
Journal Detail:
Title:  Bioorganic & medicinal chemistry     Volume:  -     ISSN:  1464-3391     ISO Abbreviation:  Bioorg. Med. Chem.     Publication Date:  2013 Apr 
Date Detail:
Created Date:  2013-4-26     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9413298     Medline TA:  Bioorg Med Chem     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2013. Published by Elsevier Ltd.
Institute of Biotechnology and Pharmaceutical Research, National Health Research Institutes, No. 35, Keyan Rd., Zhunan Town, Miaoli Country 350, Taiwan, ROC.
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