Synthetic Studies on Condensed-Azole Derivatives. III. Synthesis and Anti-asthmatic Activities of C-Substituted Alkyl Side Chain Derivatives of .OMEGA.-Sulfamoylalkylthioimidazo(1,2-b)pyridazines and Related Compounds.
A series of novel alkylthioimidazo[1,2-b]pyridazines was synthesized and evaluated for ability to inhibit platelet activating factor (PAF)-induced bronchoconstriction in guinea pigs. Among them, 3-(imidazo[1,2-b]pyridazin-6-yl)thio-2,2-dimethylpropanesulfona mide (15) showed the most potent inhibitory effect. The structure-activity relationships in this series of compounds, in particular, the effects
Chemoselective deoxygenation of ether-substituted alcohols and carbonyl compounds by B(C<sub>6</sub>F<sub>5</sub>)<sub>3</sub>-catalyzed reduction with (HMe<sub>2</sub>SiCH<sub>2</sub>)<sub>2</sub>
作者:Wenyu Yang、Lu Gao、Ji Lu、Zhenlei Song
DOI:10.1039/c8cc01163j
日期:——
B(C6F5)3-catalyzed deoxygenation of ether-substituted alcohols and carbonylcompounds has been developed using (HMe2SiCH2)2 as the reductant. This unique reagent shows distinct superiority over traditional one silicon-centered hydrosilanes, giving the corresponding alkanes in high yields with good tolerance of ethers, aryl halides and alkenes. The control experiments suggest that (HMe2SiCH2)2 might
使用(HMe 2 SiCH 2)2作为还原剂,开发了B(C 6 F 5)3催化的醚取代的醇和羰基化合物的脱氧反应。这种独特的试剂显示出优于传统的以硅为中心的氢硅烷的独特优势,可高收率地提供相应的烷烃,并对醚,芳基卤化物和烯烃具有良好的耐受性。对照实验表明(HMe 2 SiCH 2)2可能以分子内Si / O活化方式促进该方法。
Halogénoalcoxyétains II. halogéno-3 alcoxytributylétains, synthéses et propriétés—application à la preéparation d'oxétannes et d'alcools stanniques
3-Halogenoalkoxytributyltin compounds prepared from 1,3-halogenohydrins and tributyltin ethoxyde decompose at 200° leading to the corresponding oxetanes. This reaction is a very convenient method of preparation of this kind of heterocycles.
their well-explored propensity to undergo ring-opening reactions with nucleophiles. However, their application as precursors of radical species is still elusive. Herein, we present a bioinspired cobalt-catalysis-based strategy to access unprecedented modes of radical reactivity via oxetane ring-opening. This powerful approach gives access to nucleophilic radicals that engage in reactions with SOMOphiles