[EN] HETEROARYL COMPOUNDS FOR THE TREATMENT OF PAIN [FR] COMPOSÉS HÉTÉROARYLES POUR LE TRAITEMENT DE LA DOULEUR
摘要:
Compounds, and pharmaceutically acceptable salts thereof, useful as inhibitors of sodium channels are provided. Also provided are pharmaceutical compositions comprising the compounds or pharmaceutically acceptable salts and methods of using the compounds, pharmaceutically acceptable salts, and pharmaceutical compositions in the treatment of various disorders, including pain.
Regiochemically Flexible Substitutions of Di-, Tri-, and Tetrahalopyridines: The Trialkylsilyl Trick
摘要:
2,4-Difluoropyridine, 2,4-dichloropyridine, 2,4,6-trifluoropyridine, 2,4,6-trichloropyridine and 2,3,4,6-tetrafluoropyridine react with standard nucleophiles exclusively at the 4-position under halogen displacement. However, the regioselectivity can be completely reversed if a trialkylsilyl group is introduced in the 5-position of the 2,4-dihalopyridines or in the 3-position of the 2,4,6-trihalopyridines or 2,3,4,6-tetrahalopyridine. Then only the halogen most remote from the bulky silyl unit (at the 2-position in the case of the 2,4-halopyridines, at the 6-position with the other substrates) gets involved in the exchange process. After removal of the silyl protective group the nucleophile is invariably found to occupy the nitrogen-neighboring position.
Stereo- and Regioselective Alkyne Hydrometallation with Gold(III) Hydrides
作者:Anna Pintus、Luca Rocchigiani、Julio Fernandez-Cestau、Peter H. M. Budzelaar、Manfred Bochmann
DOI:10.1002/anie.201607522
日期:2016.9.26
alkynes by gold(III) hydride complexes [(C^N^C)AuH] was found to be mediated by radicals and proceeds by an unexpected binuclear outer‐sphere mechanism to cleanly form trans‐insertion products. Radical precursors such as azobisisobutyronitrile lead to a drastic rate enhancement. DFT calculations support the proposed radical mechanism, with very low activation barriers, and rule out mononuclear mechanistic
发现氢化金(III)络合物[(C ^ N ^ C)AuH]对内部和末端炔烃的加氢强化作用是由自由基介导的,并通过意想不到的双核外球机理进行,从而干净地形成反插入产物。诸如偶氮二异丁腈之类的自由基前体导致速率急剧增加。DFT计算支持拟议的激进机制,具有很低的激活障碍,并排除了单核机制的替代方案。这些炔烃水合反应对Z-乙烯基异构体的形成具有高度的区域和立体特异性,在大多数情况下Z / E比率> 99:1。