About: Titanocene Dihalides and Ferrocenes Bearing a Pendant alpha-D-Xylofuranos-5-yl or alpha-D-Ribofuranos-5-yl Moiety. Synthesis, Characterization, and Cytotoxic Activity     Goto   Sponge   NotDistinct   Permalink

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Description
  • Titanocene dichlorides of general formula [(eta(5)-C5H5)(eta(5)-C5H4R)TiCl2] (where R = 5-deoxy-1,2-di-O-isopropylidene-3-O-benzyl-alpha-D-xylofuranos-5-yl (Xylf) (8a); R = 5-deoxy-1,2-di-O-isopropylidene-3-O-benzyl-alpha-D-ribofuranos-5-yl (Ribf) (8b)) and [(eta(5)-C5H4R)(2)TiCl2] (R = Xylf (9a); R = Ribf (9b)) were prepared by reaction of the corresponding lithium cyclopentadienides 7a,b with an equimolar amount of [(eta(5)-C5H5)TiCl3] or a 0.5 mol amount of [TiCl4(THF)(2)]. Titanocene difluorides of the general formula [(eta(5)-C5H4R1)(eta(5)-C5H4R2)TiF2] (R-1 = H and R-2 = Ribf (10); R-1 = R-2 = Xylf (11a); R-1 = R-2 = Ribf (11b)) were obtained by fluorination of the corresponding titanocene dichlorides 8b and 9 with the fluorinating agent {2-(CH2NMe2)C6H4-kappa C,N}(n-Bu)(2)SnF in high yields. Alternatively, complexes 11 were prepared in a straightforward way by direct reaction of [TiF4(THF)(2)] with 2 equiv of the corresponding lithium cyclopentadienide 7a,b. Ferrocene complexes [(eta(5)-C5H4R)(2)Fe] (R = Xylf (12a); R = Ribf (12b)) were synthesized by metathesis of 2 equiv of lithium cyclopentadienide 7a,b and 1 equiv of anhydrous FeCl2. Deprotection of the benzyl group in ferrocenes 12 proceeded cleanly by a catalytic hydrogenation on Pd/C and afforded the ferrocene diols [(eta(5)-C3H4R)(2)Fe] (R = 5-deoxy-1,2-di-O-isopropylidene-alpha-D-xylofuranos-5-yl (Xylf-OH) (14a); R = 5-deoxy-1,2-di-O-isopropylidene-alpha-D-ribofuranos-5-yl (Ribf-OH) (14b)). A scaled up benzyl deprotection with Et3SiH as a hydrogen source led to the replacement of only one benzyl group, which gave the ferrocene alcohol [(eta(5)-C5H4R1)(eta(5)-C5H4R2)Fe] (R-1 = Xylf and R-2 = Xylf-OH (13)). The prepared complexes were characterized by elemental analysis, melting point determination, NMR, IR, and ESI-MS, and the molecular structure of 9b was determined by X-ray diffraction analysis.
  • Titanocene dichlorides of general formula [(eta(5)-C5H5)(eta(5)-C5H4R)TiCl2] (where R = 5-deoxy-1,2-di-O-isopropylidene-3-O-benzyl-alpha-D-xylofuranos-5-yl (Xylf) (8a); R = 5-deoxy-1,2-di-O-isopropylidene-3-O-benzyl-alpha-D-ribofuranos-5-yl (Ribf) (8b)) and [(eta(5)-C5H4R)(2)TiCl2] (R = Xylf (9a); R = Ribf (9b)) were prepared by reaction of the corresponding lithium cyclopentadienides 7a,b with an equimolar amount of [(eta(5)-C5H5)TiCl3] or a 0.5 mol amount of [TiCl4(THF)(2)]. Titanocene difluorides of the general formula [(eta(5)-C5H4R1)(eta(5)-C5H4R2)TiF2] (R-1 = H and R-2 = Ribf (10); R-1 = R-2 = Xylf (11a); R-1 = R-2 = Ribf (11b)) were obtained by fluorination of the corresponding titanocene dichlorides 8b and 9 with the fluorinating agent {2-(CH2NMe2)C6H4-kappa C,N}(n-Bu)(2)SnF in high yields. Alternatively, complexes 11 were prepared in a straightforward way by direct reaction of [TiF4(THF)(2)] with 2 equiv of the corresponding lithium cyclopentadienide 7a,b. Ferrocene complexes [(eta(5)-C5H4R)(2)Fe] (R = Xylf (12a); R = Ribf (12b)) were synthesized by metathesis of 2 equiv of lithium cyclopentadienide 7a,b and 1 equiv of anhydrous FeCl2. Deprotection of the benzyl group in ferrocenes 12 proceeded cleanly by a catalytic hydrogenation on Pd/C and afforded the ferrocene diols [(eta(5)-C3H4R)(2)Fe] (R = 5-deoxy-1,2-di-O-isopropylidene-alpha-D-xylofuranos-5-yl (Xylf-OH) (14a); R = 5-deoxy-1,2-di-O-isopropylidene-alpha-D-ribofuranos-5-yl (Ribf-OH) (14b)). A scaled up benzyl deprotection with Et3SiH as a hydrogen source led to the replacement of only one benzyl group, which gave the ferrocene alcohol [(eta(5)-C5H4R1)(eta(5)-C5H4R2)Fe] (R-1 = Xylf and R-2 = Xylf-OH (13)). The prepared complexes were characterized by elemental analysis, melting point determination, NMR, IR, and ESI-MS, and the molecular structure of 9b was determined by X-ray diffraction analysis. (en)
Title
  • Titanocene Dihalides and Ferrocenes Bearing a Pendant alpha-D-Xylofuranos-5-yl or alpha-D-Ribofuranos-5-yl Moiety. Synthesis, Characterization, and Cytotoxic Activity
  • Titanocene Dihalides and Ferrocenes Bearing a Pendant alpha-D-Xylofuranos-5-yl or alpha-D-Ribofuranos-5-yl Moiety. Synthesis, Characterization, and Cytotoxic Activity (en)
skos:prefLabel
  • Titanocene Dihalides and Ferrocenes Bearing a Pendant alpha-D-Xylofuranos-5-yl or alpha-D-Ribofuranos-5-yl Moiety. Synthesis, Characterization, and Cytotoxic Activity
  • Titanocene Dihalides and Ferrocenes Bearing a Pendant alpha-D-Xylofuranos-5-yl or alpha-D-Ribofuranos-5-yl Moiety. Synthesis, Characterization, and Cytotoxic Activity (en)
skos:notation
  • RIV/00216208:11310/14:10277912!RIV15-MSM-11310___
http://linked.open...avai/riv/aktivita
http://linked.open...avai/riv/aktivity
  • I, Z(MSM0021620857)
http://linked.open...iv/cisloPeriodika
  • 8
http://linked.open...vai/riv/dodaniDat
http://linked.open...aciTvurceVysledku
http://linked.open.../riv/druhVysledku
http://linked.open...iv/duvernostUdaju
http://linked.open...titaPredkladatele
http://linked.open...dnocenehoVysledku
  • 50627
http://linked.open...ai/riv/idVysledku
  • RIV/00216208:11310/14:10277912
http://linked.open...riv/jazykVysledku
http://linked.open.../riv/klicovaSlova
  • modular synthesis; functional titanocenes; organometallic compounds; carbohydrate chloroquine; dichloride derivatives; anticancer drugs; human serum transferrin; cyclic alkylammonium groups; potential antimalarial agents; benzyl-substituted titanocenes (en)
http://linked.open.../riv/klicoveSlovo
http://linked.open...odStatuVydavatele
  • US - Spojené státy americké
http://linked.open...ontrolniKodProRIV
  • [E25FC61F4237]
http://linked.open...i/riv/nazevZdroje
  • Organometallics
http://linked.open...in/vavai/riv/obor
http://linked.open...ichTvurcuVysledku
http://linked.open...cetTvurcuVysledku
http://linked.open...UplatneniVysledku
http://linked.open...v/svazekPeriodika
  • 33
http://linked.open...iv/tvurceVysledku
  • Císařová, Ivana
  • Hrstka, Roman
  • Pinkas, Jiří
  • Lamač, Martin
  • Karban, Jindřich
  • Červenková Šťastná, Lucie
  • Hodík, Tomáš
  • Koubkova, Lucie
http://linked.open...ain/vavai/riv/wos
  • 000335201600022
http://linked.open...n/vavai/riv/zamer
issn
  • 0276-7333
number of pages
http://bibframe.org/vocab/doi
  • 10.1021/om500200r
http://localhost/t...ganizacniJednotka
  • 11310
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