Modeling and Experiment Reveal an Unexpected Stereoelectronic Effect on Conformation and Scalar Couplings of α-Aminoorganostannanes, with Possible Relevance to the Tin−Lithium Exchange Reaction
摘要:
The solution conformation of N-methyl-2-(tributylstannyl)piperidines has been determined through the use of vicinal Sn-119-C-13 coupling constants, revealing a conformational distortion caused by an unexpected stereoelectronic effect in some cases. Specifically, the "equatorial" conformer is distorted into a half-chair, in which the nitrogen lone pair eclipses the C-Sn bond. This distortion, which "costs" approximately 1 kcal/mol, correlates with a conformational dependence of geminal Sn-119-N-15 couplings and a possible correlation with reactivity in the tin-lithium exchange reaction.
[EN] THIENOPYRROLE COMPOUNDS<br/>[FR] COMPOSÉS DE THIÉNOPYRROLE
申请人:GILEAD SCIENCES INC
公开号:WO2022221642A1
公开(公告)日:2022-10-20
The present disclosure relates generally to certain compounds, pharmaceutical compositions comprising said compounds, and methods of making and using said compounds and pharmaceutical compositions. The compounds and compositions provided herein may be used for the treatment or prevention of an autoimmune disease and/or inflammatory condition, including systemic lupus erythematosus and cutaneous lupus erythematosus.
Modeling and Experiment Reveal an Unexpected Stereoelectronic Effect on Conformation and Scalar Couplings of α-Aminoorganostannanes, with Possible Relevance to the Tin−Lithium Exchange Reaction
作者:Marcelina Santiago、Eddy Low、Gilles Chambournier、Robert E. Gawley
DOI:10.1021/jo034948y
日期:2003.10.1
The solution conformation of N-methyl-2-(tributylstannyl)piperidines has been determined through the use of vicinal Sn-119-C-13 coupling constants, revealing a conformational distortion caused by an unexpected stereoelectronic effect in some cases. Specifically, the "equatorial" conformer is distorted into a half-chair, in which the nitrogen lone pair eclipses the C-Sn bond. This distortion, which "costs" approximately 1 kcal/mol, correlates with a conformational dependence of geminal Sn-119-N-15 couplings and a possible correlation with reactivity in the tin-lithium exchange reaction.