Tris(trimethylsilyl)silane as a radical-based reducing agent in synthesis
摘要:
Tris(trimethylsilyl)silane is an effective reducing agent for organic halides, selenides, xanthates, and isocyanides, as well as an effective hydrosilylating agent for dialkyl ketones and alkenes. The silane functions as a mediator in the formation of intermolecular carbon-carbon bonds via radicals and allows a variety of organic substrates to be used as alkyl radical percursors. Absolute rate constants for the reaction of (Me3Si)3Si radicals with a variety of organic compounds have been measured in solution by laser flash photolysis. At 294 K rate constants are > 5 x 10(7) M-1 s-1 for C = C double bonds that are activated by neighboring pi-electron systems or by electron-withdrawing groups. For other substrates, reactivities decreased in the order xanthate > selenide > isocyanide > nitro > sulfide.
Synthesis of diphenylamine macrocycles and their anti-inflammatory effects
作者:Alejandra Chávez-Riveros、Eduardo Hernández-Vázquez、Antonio Nieto-Camacho、Teresa Ramírez-Apan、Luis D. Miranda
DOI:10.1039/c8ob03121e
日期:——
A collection of fourteen diphenylamine macrocyclic derivatives containing a peptide chain with different substituents was synthesized using a protocol of two Ugi four component reactions (Ugi-4CR) and a Buchwald–Hartwig macrocyclization. Their anti-inflammatory effects were assayed with an ear edema model using 12-O-tetradecanoylphorbol-13-acetate, while the activity of myeloperoxidase was determined
Expanding the structure-activity relationship of cytotoxic diphenyl macrocycles
作者:Alejandra Chávez-Riveros、Ángel Ramírez-Trinidad、Eduardo Hernández-Vázquez、Luis D. Miranda
DOI:10.1016/j.bmcl.2022.128628
日期:2022.4
Twenty-four biaryl tetrapeptide macrocycles were synthesized as an extension of our previous work. Two groups of compounds were constructed for establishing a structure–activity relationship: one having an aromatic substituent at α-position of one exo-peptide and the other group with a variation in the size of the lipophilic chain. Compound 13t had the best cytotoxicity from all the compounds tested
Procatalysts, catalyst systems, and use in olefin polymerization
申请人:——
公开号:US20010025005A1
公开(公告)日:2001-09-27
There are described solid procatalysts, catalyst systems incorporating the solid procatalysts, and the use of the catalyst systems in olefin polymerization and interpolymerization.
Procatalysts, catalyst systems, and use in OLEFIN polymerization
申请人:——
公开号:US20010029286A1
公开(公告)日:2001-10-11
There are described solid procatalysts, catalyst systems incorporating the solid procatalysts, and the use of the catalyst systems in olefin polymerization and interpolymerization.
The Structural and Functional Equivalence of Aurophilic and Hydrogen Bonding: Evidence for the First Examples of Rotator Phases Induced by Aurophilic Bonding
作者:Robert E. Bachman、Michael S. Fioritto、Susan K. Fetics、T. Matthew Cocker