Lithium diselenide in aprotic medium - a convenient reagent for synthesis of organic diselenides
作者:Ludwik Syper、Jacek Mlochowski
DOI:10.1016/s0040-4020(01)89801-x
日期:1988.1
The reduction of selenium with lithium in THF in the presence of diphenylacetylene as a catalyst afforded lithium diselenide, which reacted with electrophiles giving alkyl or aryl diselenides 1 - 3 and selenides 4, as by-products. The useful method for preparation of diselenides based on this reaction was elaborated.
One pot synthesis of selenocysteine containing peptoid libraries by Ugi multicomponent reactions in water
作者:Muhammad Abbas、John Bethke、Ludger A. Wessjohann
DOI:10.1039/b514597j
日期:——
Selenocysteine containing peptoids and peptide–peptoid conjugates were synthesized by combinatorial Ugi-MCRs (multicomponent reactions) in water: for the first time, an acetal (selenoacetal 2a) was used in Ugi-MCR to furnish selenocysteine peptoids in one step as model compounds for selenocysteine peptides and proteins.
N-Alkyl bis(2-selanylethyl)amines catalyze the synthesis of peptide thioesters or peptide ligation from bis(2-sulfanylethyl)amido (SEA) peptides. These catalysts are generated in situ by reduction of the corresponding cyclic diselenides by tris(2-carboxyethyl)phosphine. They are particularly efficient at pH 4.0 by accelerating the thiol–thioester exchange processes, which are otherwise rate-limiting
Multicomponent reactions for the synthesis of multifunctional agents with activity against cancer cells
作者:Saad Shabaan、Lalla A. Ba、Muhammad Abbas、Torsten Burkholz、Annika Denkert、André Gohr、Ludger A. Wessjohann、Florenz Sasse、Wolfgang Weber、Claus Jacob
DOI:10.1039/b823149d
日期:——
Multicomponent Passerini and Ugi reactions enable the fast and efficient synthesis of redox-active multifunctional selenium and tellurium compounds, of which some show considerable cytotoxicity against specific cancer cells.
多组分 Passerini 和 Ugi 反应能够快速高效地合成具有氧化还原作用的多功能硒和碲化合物,其中一些化合物对特定癌细胞具有相当强的细胞毒性。
Synthesis and Selective Anticancer Activity of Organochalcogen Based Redox Catalysts
作者:Mandy Doering、Lalla A. Ba、Nils Lilienthal、Carole Nicco、Christiane Scherer、Muhammad Abbas、Abdul Ali Peer Zada、Romain Coriat、Torsten Burkholz、Ludger Wessjohann、Marc Diederich、Frederic Batteux、Marco Herling、Claus Jacob
DOI:10.1021/jm100576z
日期:2010.10.14
Many tumor cells exhibit a disturbed intracellular redox state resulting in higher levels of reactive oxygen species (ROS). As these contribute to tumor initiation and sustenance, catalytic redox agents combining significant atctivity with substrate specificity promise high activity andselectivity L. Must oxidatively stressed malignant cells. We describe here the design and synthesis of novel organochalcogen based redox sensor/effector catalysts. Their selective anticancer activity at submicromolar and low micromolar concentrations was established here in a range of tumor entities in various biological systems including cell lines, primary tumor cell cultures, and animal models. In the B-cell derived chronic lymphocytic leukemia (CLL), for instance, such compounds preferentially induce apoptosis in the cancer cells while peripheral blood mononuclear cells (PBMC) from healthy donors and the subset of normal 13-cells remain largely unaffected. In support of the concept of sensor/effector based ROS amplification, we are able to demonstrate that underlying this selective activity against CI.I. cells are pre-existing, elevated ROS levels in the leukemic cells compared to their nonmalignant counterparts. Furthermore, the catalysts act in concert with certain chemotherapeutic drugs in several carcinoma cell lines to decrease cell proliferation while showing no such interactions in normal cells. Overall, the high efficacy and selectivity of. (redox) catalytic sensor/effector compounds warrant further, extensive testing toward transfer into the clinical arena.