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Synthesis of 5-substituted 2'-deoxyuridines 总被引:1,自引:0,他引:1
A series of thymidylate synthetase inhibitors was synthesized, some of which were potential irreversible inhibitors. 5-Formyl-2'-deoxyuridine (9) and its dithiolane derivative 11 were prepared by condensation of the bis(trimethylsilyl) derivative of 5-formyluracil dimethyl acetal and the protected chloro sugar followed by saponification of the protective groups. 5-Acetyl-2'-deoxyuridine (15) was prepared in the same way from 5-acetyluracil. Treatment of the diester of 5-allyl-2'-deoxyuridine (17 or 22) with m-chloroperbenzoic acid gave the corresponding epoxide. Dimethylamine removed the ester groups and opened the epoxide to give the amino alcohol 24. The diester of 5-chloromethyl-2'-deoxyuridine (27) treated with methanol or sodium azide gave 5-methoxymethyl- (29) and 5-azidomethyl- (31) 2'-deoxyuridines. Compound 27 also was converted to 5-iodoacetamidomethyl-2'-deoxyuridine by treatment with ammonia, chloroacetyl chloride, base saponification, and finally sodium iodide. 相似文献
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Kampf Thomas Sturm Volker J. F. Basse-Lüsebrink Thomas C. Fischer André Buschle Lukas R. Kurz Felix T. Schlemmer Heinz-Peter Ziener Christian H. Heiland Sabine Bendszus Martin Pham Mirko Stoll Guido Jakob Peter M. 《Magma (New York, N.Y.)》2019,32(1):63-77
Magnetic Resonance Materials in Physics, Biology and Medicine - In magnetic resonance imaging (MRI), compressed sensing (CS) enables the reconstruction of undersampled sparse data sets. Thus,... 相似文献
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Anthony R. Kampf 《Rocks & Minerals》2013,88(2):159-162
James Gurney, The World of Dinosaurs, text by Michael Brett-Surman and Thomas Holtz Jr. Greenwich Workshop Press, Shelton, Conn. 48 pages; 1998; $19.95 (hardbound). 相似文献
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Grundwasser - Im Großraum Grünstadt erfolgt die Wasserversorgung weitgehend dezentral aus Grundwasserleitern des Buntsandsteins. Dieser ist aufgrund der geologisch-tektonischen... 相似文献
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CW Campagnoni K Kampf B Mason VW Handley AT Campagnoni 《Canadian Metallurgical Quarterly》1994,19(8):1061-1065
A cDNA was isolated from a zebra finch telencephalon cDNA library that encodes the myelin proteolipid protein. The clone was 2874 nucleotides long containing an open reading frame of 831 nucleotides that encoded a 277 amino acid myelin proteolipid protein. The 5'- and 3' untranslated regions were 112 and 1931 nucleotides, respectively. In Northern blots the clone hybridized to 3 bands of 3.5, 2.4 and 1.5 Kb in mouse brain RNA, but to only a single band of 3.0 kb in zebra finch brain RNA, suggesting the lack of alternative polyadenylation sites within the 3' untranslated region of the zebra finch PLP mRNAs. There was a small degree of homology between the zebra finch and chicken PLP 5' untranslated regions, but relatively little homology of the 5' untranslated regions of the zebra finch PLP cDNA clone with the homologous regions of PLP cDNAs of many mammalian species. Except for a small stretch of considerable homology, there was little overall homology with the 3' untranslated regions of mammalian PLP mRNAs. Approximately 10% (i.e. 28) of the amino acids in the zebra finch PLP differed from mammalian PLP, with most of these changes located within exon 3. There were 16 amino acid changes between zebra finch and chicken, suggesting that greater sequence variation in PLP structure is tolerated among avian species than among mammalian species. 相似文献
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Arieh Kampf Sarina Grinberg Arjeh Galun 《Journal of the American Oil Chemists' Society》1986,63(2):246-248
The rates of autoxidation of crude, bleached and stripped jojoba wax were determined under conditions of accelerated oxidation
(98 C). Oxidation of the raw yellow wax had a long induction period (50 hr) compared with the bleached wax (10–12 hr) or stripped
wax (2 hr). These differences indicate the presence of a natural antioxidant in the crude wax. Addition of 0.02% butylated
hydroxytoluene or butylated hydroxyanisole to the bleached wax restored and even improved its stability. Autoxidation of jojoba
wax was also studied at room temperature. In the presence of light and air, the activity of the natural inhibitor was rapidly
lost. 相似文献
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G Kampf B Dietze C Grosse-Siestrup C Wendt H Martiny 《Canadian Metallurgical Quarterly》1998,42(9):2440-2442
The survival of three bacterial species and Candida albicans was studied on SPI-ARGENT II. The immediate recovery from silver-impregnated polymer and control polymer (1 cm2) was approximately 10(6) to 10(7) microorganisms. After incubation (37 degreesC) and neutralization of silver with horse serum (5%), surviving organisms were recovered. The survival of the microorganisms on the polymer was not found to be influenced by the silver implantation. 相似文献