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C-Terminal Bioconjugation of Peptides through Photoredox Catalyzed Decarboxylative Alkynylation

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Oxidation of carboxylic acids at boron-doped diamond electrodes for wastewater treatment

Christos Comninellis, Pierre-Alain Michaud

Thin boron-doped diamond films were prepd. by HF CVD (hot filament chem. vapor deposition technique) on conductive p-Si substrate (Si/diamond). The morphol. of these Si/diamond electrodes was investigated by SEM and Raman spectroscopy. The electrochem. beh ...

2000

Reversible Gelation of Poly(dimethylsiloxane) with Ionic and Hydrogen-Bonding Substituents

Harm-Anton Klok

Poly(dimethylsiloxane) copolymers containing a small fraction of carboxylic acid or Zn-carboxylate groups were prepared and compared regarding reversible gelation by hydrogen-bonding and ion-pair interaction. The polymers were synthesized by condensation o ...

1999

The natural beta-amino acid deriv. Boc-Asp-OBn (Boc = Me3CO2C; Bn = CH2Ph), as well as I (R = CH2CH2CO2Bn, CH2OBn; TCE = CH2CCl3) (prepd. from appropriately protected glutamic acid and serine, resp., by Arndt-Eistert homologation), were employed as buildin ...

1998

Solid phase syntheses of the OF4949 derivs. I (R = H, CH2CONH2) and II (R1 = H, R2 = H, NH2; R1 = NH2, R2 = H) were performed via protection/deprotection of tyrosine side chains on a support, and SNAr macrocyclization reactions. [on SciFinder (R)] ...

1997

Synthesis of Modified Carboxyl Binding Pockets of Vancomycin and Teicoplanin

Jieping Zhu

Sixteen-membered macrocycle I (R = H) and 16+14 bicyclic compd. II, incorporating a terminal primary hydroxyl group in the peptide sequence, have been designed and synthesized. The syntheses feature the use of an efficient cycloetherification based on an i ...

1996

A New Approach to the Synthesis of Piperazinomycin and Bouvardin: Facile Access to Cycloisodityrosine via an Intramolecular SNAr Reaction

Jieping Zhu

A new method for the synthesis of cycloisodityrosine atropisomers I (R1 = CO2Me, R2 = NHBoc), a 14-membered m,p-cyclophane, is reported. The synthesis hinged on an efficient macrocyclization procedure for biaryl ether formation based on an intramol. SNAr r ...

1996

Synthese, Stereochemie und Reaktionen von Ruthenium(II) und Osmium(II)- Komplexen mit a-Aminocarboxylat-Liganden

Kay Severin

Metal Complexes of Biologically Important Ligands, LXX[1].- Synthesis, Stereochemistry and Reactions of Ruthenium(II) and Osmium(II) Complexes with -Amino Carboxylates. The reactions of MHCl(CO)(PPh3)3 with salts of -amino acids give the hydrido-N,O-chelat ...

1994

Regioselective and Stereoselective Thioamination of 7-Oxabicyclo[2.2.1]Hept-5-En-2-Yl Derivatives

Pierre Vogel

Under acidic conditions (1RS,2SR,4RS,5RS,6SR-6-exo-cyano-3-thiobenzoyl-8-oxa-3-azatricyclo[3.2.1 .0(2,4)]oct-6-endo-yl acetate was rearranged selectively into (1RS,2RS,6RS,7RS,9SR)-9-exo-cyano-4-phenyl-3,10-dioxa-5-aza-3-thiatricyc lo[5.2.1.0(2,6)]dec-4-en ...

1993

The appropriate b-hetero-substituted alkyl and alkenyl iodide in 2:2:1:1 methylal-tetrahydrofuran-Et2O-pentane at -130 Deg with BuLi yielded by iodine-Li exchange the corresponding Li derivs. which were characterized by carboxylation and subsequent esterif ...

1966