Flow synthesis of annulated 5-aryl-substituted pyridines by tandem intramolecular inverse-electron-demand hetero-/retro-Diels–Alder reaction
作者:Rainer E. Martin、Mario Lenz、Thibaut Alzieu、Johannes D. Aebi、Liliane Forzy
DOI:10.1016/j.tetlet.2013.09.069
日期:2013.12
5-Aryl-substituted annulatedpyridines can be accessed directly from the corresponding acetylene substituted pyrimidines through an intramolecularinverse-electron-demand hetero-/retro-Diels–Alder (ihDA/rDA) reaction cascade carried out in continuousflow. Exploiting this new process, a series of cycloalka[c]pyridines that represent useful building blocks for medicinal chemistry were prepared in good
可以通过连续流动进行的分子内逆电子需求杂-/反-Diels-Alder(ih DA / r DA)反应级联,从相应的乙炔基取代的嘧啶中直接获得5-芳基取代的环已吡啶。利用这种新工艺,一系列cycloalka的[ C ^ ]吡啶表示为药物化学有用积木良好制备用短处理时间优异的产率(<45分钟)。重要的是,利用使流体中的溶剂过热的能力允许用甲苯代替通常使用的高沸点溶剂(例如,硝基苯或氯苯)。
Copper‐Catalyzed Enantio‐, Diastereo‐, and Regioselective [2,3]‐Rearrangements of Iodonium Ylides
作者:Bin Xu、Uttam K. Tambar
DOI:10.1002/anie.201705317
日期:2017.8.7
The first highly enantioselective, diastereoselective, and regioselective [2,3]-rearrangement of iodonium ylides has been developed as a general solution to catalytic onium yliderearrangements. In the presence of a chiral copper catalyst, substituted allylic iodides couple with α-diazoesters to generate metal-coordinated iodonium ylides, which undergo [2,3]-rearrangements with high selectivities (up
Provided is a novel amine compound represented by the following formula (I) having a superior peripheral blood lymphocyte decreasing action and superior in the immunosuppressive action, rejection suppressive action and the like, which shows decreased side effects of, for example, bradycardia and the like, or a pharmaceutically acceptable acid addition salt thereof, or a hydrate thereof, or a solvate thereof.
wherein each symbol is as defined in the specification.
Synthesis of chiral phosphorus compounds from readily available substrates by a facile method is an attractive strategy. In this study, an efficient route for copper-catalyzedasymmetric boroprotonation of phosphinylallenes with bis(pinacolato)diboron with high regioselectivity was developed, affording chiral allylphosphine oxides in high yields with high enantioselectivities of up to 98% ee. The synthetic
通过简便的方法从容易获得的底物合成手性磷化合物是一种有吸引力的策略。在这项研究中,开发了一种铜催化的膦基丙二烯与双(频哪醇)二硼的高区域选择性不对称硼质子化的有效途径,以高产率和高达 98% ee 的高对映选择性提供手性烯丙基氧化膦。通过将手性烯丙基氧化膦轻松转化为几种立体特异性产物,进一步证明了合成效用。