期刊
BIOORGANIC & MEDICINAL CHEMISTRY LETTERS
卷 16, 期 5, 页码 1430-1433出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.bmcl.2005.11.032
关键词
alpha-methylidene-beta-lactones; isoxazolidin-5-ones; cytostatic activity; Horner-Wadsworth-Emmons olefination
A novel, general method of synthesis of 4-methylideneisoxazolidin-5-ones 10 is described. The target compounds were synthesized starting from ethyl 2-diethoxyphosphoryl-2-alkenoates 6 or dicyclohexylammonium 4-diethoxyphosphoryl-2-alkenoates 7. Addition of N-methylhydroxylamine hydrochloride to these Michael acceptors, lactonization to 4-diethoxyphosphorylisoxazolidin-5-ones 9, and Horner-Wadsworth-Emmons olefination of formaldehyde using 9 gave the title isoxazolidinones 10. All obtained compounds were tested against L-1210, HL-60, and NALM-6 leukemia cell lines. Several isoxazolidinones 10 were found to be very potent with IC50 < 1 mu M. The highest cytostatic activity against HL-60 was observed for 10a and against NALM-6 for 10b with IC50 values of 0.74 and 0.34 mu M, respectively. (C) 2005 Elsevier Ltd. All rights reserved.
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