Electron-transfer bond-breaking processes: an example of nonlinear activation-driving force relationship in the reductive cleavage of the carbon-sulfur bond
摘要:
The heterogeneous (electrode) and homogeneous electron transfer (ET) to triphenylmethyl p-cyanophenyl sulfide in N,N'-dimethylformamide is shown to involve the irreversible reductive cleavage of the C(alkyl)-S sigma-bond through a sequential charge-transfer/bond-breaking pathway. The intermediate formation of the sulfide anion radical, whose lifetime has been determined to be ca. 10 ns, evidences the outer-sphere nature of the initial ET. The kinetics of this step has been analyzed as a function of the reaction free energy. Heterogeneous rate constants have been determined as a function of the applied potential from voltammetric curves and their convolution. The kinetics of the homogeneous ET from a series of substituted azobenzene anion radicals has been investigated by voltammetric redox 'catalysis. Both the homogeneous and the heterogeneous reactions show a quadratic dependence of the activation free energy on the driving force. The rate constant data have been treated in terms of classical ET theories in order to obtain the corresponding thermodynamic and kinetic parameters. Noteworthy, the values of the standard potential for the sulfide/sulfide anion radical redox couple, derived in the treatment of the two independent sets of homogeneous and heterogeneous data, are practically coincident. Structural parameters, from semiempirical MO calculations on azobenzene and its anion radical have been used to evaluate the azobenzene contribution to the cross ET activation energy and consequently to estimate, by comparison with the experimental results, the electron-exchange activation energy for the sulfide. The transition from the neutral sulfide to its anion radical involves relevant variations of the internal coordinates, in agreement with the very fast anion radical fragmentation.
There are disclosed compounds that modulate or inhibit the enzymatic activity of indoleamine 2,3-dioxygenase (IDO), pharmaceutical compositions containing said compounds and methods of treating proliferative disorders, such as cancer, viral infections and/or inflammatory disorders utilizing the compounds of the invention.
Catalytic Hydrogenation of Amides to Amines under Mild Conditions
作者:Mario Stein、Bernhard Breit
DOI:10.1002/anie.201207803
日期:2013.2.18
Under (not so much) pressure: A general method for the hydrogenation of tertiary and secondary amides to amines with excellent selectivity using a bimetallic Pd–Re catalyst has been developed. The reaction proceeds under low pressure and comparatively low temperature. This method provides organic chemists with a simple and reliable tool for the synthesis of amines.
[EN] INHIBITOR OF INDOLEAMINE-2,3-DIOXYGENASE (IDO)<br/>[FR] INHIBITEUR DE L'INDOLÉAMINE-2,3-DIOXYGÉNASE (IDO)
申请人:INVENTISBIO INC
公开号:WO2017139414A1
公开(公告)日:2017-08-17
The present disclosure provides compounds of Formula (I). The compounds described herein may be useful in treating a disease associated with IDO, for example, cancer or an infectious disease (e.g., viral or bacterial infectious diseases). Also, provided in the present disclosure are pharmaceutical compositions, kits, methods, and uses including or using a compound described herein.
Controlled and Chemoselective Reduction of Secondary Amides
作者:Guillaume Pelletier、William S. Bechara、André B. Charette
DOI:10.1021/ja105194s
日期:2010.9.22
presence of 2-fluoropyridine. The electrophilic activated amide can then be reduced to the corresponding iminium using triethylsilane, a cheap, rather inert, and commercially availablereagent. Imines can be isolated after a basic workup or readily transformed to the aldehydes following an acidic workup. The amine moiety can be accessed via a sequential reductive amination by the addition of silane and
Described are RORγ modulators of the formula (I),
or stereoisomers, tautomers, pharmaceutically acceptable salts, solvates, or prodrugs thereof, wherein all substituents are defined herein. Also provided are pharmaceutical compositions comprising the same. Such compounds and compositions are useful in methods for modulating RORγ activity in a cell and methods for treating a subject suffering from a disease or disorder in which the subject would therapeutically benefit from modulation of RORγ activity, for example, autoimmune and/or inflammatory disorders.