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)。
Silver-Catalyzed Synthesis of Substituted Pyridine Derivatives from <i>N</i>
-Propargylic α-Enamino Esters
A wide range of substituted pyridine derivatives were synthesized in moderate to good yields from a N-propargylic α-enamino ester. The synthetic strategy involves regioselective addition of propargyl amine to the α-carbon of the alkynyl ester to produce N-propargylic α-enamino ester which acts as the key intermediate for the synthesis of the pyridine derivatives.
A compound having the general structure of Formula (I):
or a pharmaceutically acceptable salt, solvate, or ester thereof, is useful in treating diseases, disorders, or conditions such as obesity, metabolic disorders, addiction, diseases of the central nervous system, cardiovascular disorders, respiratory disorders, and gastrointestinal disorders.
Synthesis of thiazolo[2,3-<i>b</i>]quinazoline derivatives <i>via</i> base-promoted cascade bicyclization of <i>o</i>-alkenylphenyl isothiocyanates with propargylamines
A highly efficient cascade bicyclization reaction of o-alkenylphenyl isothiocyanates with propargylamines has been developed, which affords a series of thiazolo[2,3-b]quinazolines in good to excellent yields by using K2CO3 as a base in MeCN at 80 °C. This method is transition-metal-free and operationally simple with broad functional group tolerance. Mechanistically, 6-exo-trig hydroamination followed
Synthesis of Isoxazoles via One-Pot Oxidation/Cyclization Sequence from Propargylamines
作者:Mengyan Duan、Guodong Hou、Yabiao Zhao、Congjun Zhu、Chuanjun Song
DOI:10.1021/acs.joc.2c00896
日期:2022.8.19
A facile strategy for the synthesis of isoxazoles has been efficaciously developed, which involves oxidation of propargylamines to the corresponding oximes followed by CuCl-mediated intramolecular cyclization of the latter. This protocol shows a straightforward way to construct a series of isoxazole cores with a wide range of functional group compatibility. Meanwhile, a gram-scale experiment and synthetic