在乙腈中研究了取代的肉桂酰氯和 3-芳基-2-丙炔氯与四乙基氯化铵-36Cl 的氯同位素交换反应。在这两种情况下,给电子基团都加速了反应。发现丙炔氯具有可接受的线性哈米特关系。肉桂酰氯给出了由 p 取代化合物的凹 U 形关系叠加的 m 取代化合物的线性关系。在类似的同位素交换反应中,与 2-芳基乙基氯相比,两类化合物的速率提高了 102-3 倍。讨论了这些 SN2 反应的特征。
Secondary allylic alcohols were synthesized from linear allylichalides or carbonates using a catalytic amount of a ruthenium complex in the presence of boronic acid. The effects of solvent, base, ruthenium precursor, and boronic acid were fully explored, and the scope of the reaction was extended to various substrates. We also describe a preliminary investigation towards an enantioselective process
A new method has been developed for the copper-mediated trifluoromethylthiolation of allylic halides by using potassium fluoride, elemental sulfur, and (trifluoromethyl)trimethylsilane in anhydrous N,N-dimethylformamide. This protocol provides facile access to a variety of allylic trifluoromethylthioethers in moderate to good yields under mild, ligand-free reaction conditions.
Discovery and synthesis of a new class of opioid ligand having a 3-azabicyclo[3.1.0]hexane core. An example of a ‘magic methyl’ giving a 35-fold improvement in binding
作者:Graham Lunn、Bernard J. Banks、Robert Crook、Neil Feeder、Alan Pettman、Yogesh Sabnis
DOI:10.1016/j.bmcl.2011.05.132
日期:2011.8
looking for a novel achiral μ opioid receptorantagonist for the treatment of pruritus, we designed and synthesised azabicyclo[3.1.0]hexane compounds as a new class of opioid ligand. During optimisation, an addition of a single methyl resulted in a 35-fold improvement in binding. An early example from the series had excellent μ opioid receptorantagonistantagonist activity and was very effective in
Synthesis, Molecular Modeling, and Opioid Receptor Affinity of 9,10-Diazatricyclo[4.2.1.1<sup>2,5</sup>]decanes and 2,7-Diazatricyclo[4.4.0.0<sup>3,8</sup>]decanes Structurally Related to 3,8-Diazabicyclo[3.2.1]octanes
作者:Paola Vianello、Alberto Albinati、Gerardo A. Pinna、Antonio Lavecchia、Luciana Marinelli、Pier Andrea Borea、Stefania Gessi、Paola Fadda、Silvia Tronci、Giorgio Cignarella
DOI:10.1021/jm991140q
日期:2000.6.1
Various lines of evidence, including molecular modeling studies, imply that the endoethylenic bridge of 3,8-diazabicyclo[3.2.1]octanes (DBO, 1) plays an essential role in modulating affinity toward mu opioid receptors. This hypothesis, together with the remarkable analgesic properties observed for N-3 propionyl, N-8 arylpropenyl derivatives (2) and of the reverted isomers (3), has prompted us to insert an additional endoethylenic bridge on the piperazine moiety in order to identify derivatives with increased potency toward this receptor class. In the present report, we describe the synthesis of the novel compounds 9,10-diazatricyclo[4.2.1.1(2.5)]decane (4) and 2,7-diazatricyclo[4.4.0.0(3,8)]decane (5), as well as the representative derivatives functionalized at the two nitrogen atoms by propionyl and arylpropenyl groups (6a-e, 7a-d). Opioid receptor binding assays revealed that, among the compounds tested, the N-propionyl-N-cinnamyl derivatives 6a and 7a exhibited the highest mu-receptor affinity, and remarkably, compound 7a displayed in vivo (mice) an analgesic potency 6-fold that of morphine.