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1Author    Kleomenis Barlos, Dimitrios TheodoropoulosRequires cookie*
 Title    Synthesis of N-Trityl-L-homoserine  
 Abstract    L-Homoserine was tritylated via its silylated product with Me2SiCl2 or Ph2SiCl2 in 65-68% yield. Also N-Trt-L-methionine upon treatment with Mel and degradation of the resulting sulfonium salt with KOH yielded N-Trt-L-homoserine in 75% yield. Both routes provided N-Trityl-L-homoserine with identical physical data. In contrast to N-alkyloxycarbonyl-L-homoserine derivatives, N-Trt-L-homoserine shows no tendency to spontaneous lactonization. 
  Reference    Z. Naturforsch. 37b, 886—888 (1982); received December 29 1981 
  Published    1982 
  Keywords    Homoserine, Silylation, Tritylation, Methionine Degradation 
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 TEI-XML for    default:Reihe_B/37/ZNB-1982-37b-0886.pdf 
 Identifier    ZNB-1982-37b-0886 
 Volume    37 
2Author    Requires cookie*
 Title    Reaktionen koordinierter Liganden, V1  
 Abstract    Reaktionen an funktionellen Gruppen von Azido-, Amino-und Hydrazidophosphinkomplexen des Typs cis-Mo(CO)4L2 Reactions of Coordinated Ligands, V 1 Reactions a t Functional Groups of Azido-, Amino-, and Hydrazidophosphine Complexes of the Type a\s-Mo(CO)4L 2 O t h m a r S t e l z e r *, H a n s -B e r n h a r d E i k m e i e r u n d G e r d J o h a n n s e n Azidophosphine The azidophosphine complexes cis-Mo(CO)4 (R2PN3)2 (R = Me, Ph) may be ob­ tained by nucleophilic displacement reactions of chlorine by azide ion in complexes cis-Mo(CO)4 (R2PCl)2-The thermal decomposition and Staudinger reactions were studied. Silylation of NH-or NH2-functional groups in aminophosphine and hydrazinophosphine complexes with MesSiCl, Me2SiCl2 or Me2SiCl-SiClMe2 leads to a series of monodentate or bidentate silylaminophosphine complexes, e.g. (CO)4Mo(R2PNHSiMe3)2, (CO)4Mo-(R2PNH)2SiMe2, (CO)4Mo(R2PNH)2(SiMe2)2, (CO)4Mo[R2PN(SiMe3)(SiMe3)NPR2] or (CO)4Mo[R2P-N(SiMe3)SiMe2-SiMe2-N(SiMe3)PR2]. The structures of these complexes are discussed on the basis of their IR and NMR spectra. 
  Reference    (Z. Naturforsch. 32b, 1449—1454 [1977]; eingegangen am 6. Juli 1977) 
  Published    1977 
  Keywords    Complexes, Staudinger Reaction, Silylation, Aminophosphine Complexes 
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 TEI-XML for    default:Reihe_B/32/ZNB-1977-32b-1449.pdf 
 Identifier    ZNB-1977-32b-1449 
 Volume    32 
3Author    Hubertus Von Nicolai, Heinz Egge, Fritz ZillikenRequires cookie*
 Title    Gaschromatographisch-massenspektrometrische Analyse neutraler und saurer Oligosaccharide der Frauenmilch als Trimethylsilyläther * Gas Chromatographic Mass Spectrometric Analysis of Neutral and Acid Oligo­ saccharides from Human Milk as Their Trimethylsilyl Derivatives  
 Abstract    Gas chromatography and the 20 eV mass spectra of the human milk oligosaccharides fucosido-galactose, fucosido-lactose, di-fucosido-lactose, 3'-N-acetylneuraminyl-lactose, 6'-N-acetylneuraminyl-lactose and of N-acetyllactosamine as pertrimethylsilyl (TMS) ethers are described. The gas chromatographic separation of the L-fucose containing oligosaccharides was performed on Silicone SE 30. The sialic acid containing sugars were separated on DEXSIL 300. The correlations between oligosaccharide structures and mass spectrometric fragmentation pat­ terns are discussed. 
  Reference    (Z. Naturforsch. 30c, 451—459 [1975]; eingegangen am 17. Januar/14. April 1975) 
  Published    1975 
  Keywords    Human Milk Oligosaccharides, Silylation, Gas Chromatography, Mass Spectrometry 
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 TEI-XML for    default:Reihe_C/30/ZNC-1975-30c-0451.pdf 
 Identifier    ZNC-1975-30c-0451 
 Volume    30 
4Author    Ann Herm, Eckhard Frister, SchlimmeRequires cookie*
 Title    RingÖffnungsreaktionen an bioreaktiven Lactamsystemen Ring Opening Reactions of Bioreactive Lactam Systems  
 Abstract    l-ß-D -R ibofuranosylpyrrolidin-2,5-dione (9) was synthesized by ribosylation o f N-silylated succinimide (7) with 1,2,3,5-tetra-O -acetyl-ß-D -ribofuranose in acetonitril in the presence o f tin tetrachloride. The com pounds 9, l-ß-D -ribofuranosyl-l-H -pyrrol-2,5-dione (5) and N-methyl-maleinimide (2) were converted with am m onia to the ring-opened com ponents 16,14 and 15. The bioreactivity o f the N -m aleinim ide derivatives 2 and 5 with respect to addition and ring-opening reactions with am ino acid side chains containing either thiol or am ino groups was shown in model reactions with glutathion (com pds. 17, 18) and lysine (com pds. 19, 20). The ring opening reaction o f 3 -m eth y l-3 -p h en y l-l-ß -D -rib o fu ra n o sy lp y rro lid in -2 . d em onstratin g the p o ssib ility o f g ly co su c cin y la tio n o f 
  Reference    Z. Naturforsch. 42c, 603 (1987); received D ecem ber 15 1986/February 11 1987 
  Published    1987 
  Keywords    Lactam Systems, Silylation, R ibosylation, R ibonucleosides, Bioselectivity 
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 TEI-XML for    default:Reihe_C/42/ZNC-1987-42c-0603.pdf 
 Identifier    ZNC-1987-42c-0603 
 Volume    42 
5Author    Kurt-Peter Raezke, Hermann Frister, Eckhard SchlimmeRequires cookie*
 Title    Ribosylierung mono-und bicyclischer Dicarbonsäureimide Ribosylation of Mono-and Bicyclic Dicarboxylic Acid Imides  
 Abstract    The N-trimethylsilyl compounds of the cyclic imides derived from c/s-cyclohexan-l,2-dicar-boxylic acid, cw-4-cyclohexen-l,2-dicarboxylic acid and phthalic acid were prepared. Reaction of the N-silylated cyclic imides 2 and 10 with 1,2,3,5-tetra-O-acetyl-ß-D-ribofuranose in the presence of tin tetrachloride yielded the appropriate unusual ribonucleosides 4 and 12 whereas 14 led only to traces of the ribosylated derivative. The silylation and ribosylation sites in the aforementioned bicyclic imides were proved by "H, 13 C, and 29 Si NMR spectroscopy and compared with data found for the monocyclic imides N-succinimide and N-maleinimide. 
  Reference    Z. Naturforsch. 43c, 397—402 (1988); received November 26 1987/February 9 1988 
  Published    1988 
  Keywords    Dicarboxylic Acid Imides, Lactam Systems, Silylation, Ribosylation, Ribonucleosides 
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 TEI-XML for    default:Reihe_C/43/ZNC-1988-43c-0397.pdf 
 Identifier    ZNC-1988-43c-0397 
 Volume    43