Electrochemical Synthesis of
<i>O</i>
‐Phthalimide Oximes from
<i>α</i>
‐Azido Styrenes
<i>via</i>
Radical Sequence: Generation, Addition and Recombination of Imide‐
<i>N</i>
‐Oxyl and Iminyl Radicals with C−O/N−O Bonds Formation
作者:Stanislav A. Paveliev、Artem I. Churakov、Liliya S. Alimkhanova、Oleg O. Segida、Gennady I. Nikishin、Alexander O. Terent'ev
DOI:10.1002/adsc.202000618
日期:2020.9.21
Electrochemically induced radical‐initiated reaction of vinyl azides with N‐hydroxyphthalimide resulting O‐phthalimide oximes with challenging for organic chemistry N−O‐N fragment has been discovered. The developed approach introduces in synthesis electrochemically generated O‐centered imide‐N‐oxyl radicals as the coupling components. Sequential formation of C−O and N−O bonds was achieved via generation
Herein, we report the first example of group transfer radical addition of O-vinylhydroxylamine derivatives onto unactivatedalkenes. By utilizing O-vinylhydroxylamine derivatives as both the N- and C-donors, this reaction enables intermolecular carboamination of unactivatedalkenes in an atom economical fashion. As the process is initiated through N-radical addition followed by C-transfer, linear carboamination
在此,我们报告了第一个将 O-乙烯基羟胺衍生物基团转移自由基加成到未活化烯烃上的例子。通过使用 O-乙烯基羟胺衍生物作为 N 和 C 供体,该反应能够以原子经济的方式对未活化的烯烃进行分子间碳胺化。由于该过程是通过 N-自由基加成和 C-转移引发的,因此提供了线性碳胺化产物。这与烯烃的经典自由基碳官能化不同,后者通常有利于支链产物,因为它是由 C-自由基加成引发的。
Stereomutation in the Seyferth reaction
作者:Joseph B. Lambert、Eric G. Larson、Richard J. Bosch、Mollie L. E. TeVrucht
DOI:10.1021/ja00305a019
日期:1985.9
La reaction de cyclopropanation entre le dibromomethylene, obtenu a partir du reactif Seyferth (PhHgCBr 3 ), et les alcenes electroniquement deficients est non stereospecifique
La反应 de cyclopropanation entre le dibromomethylene, obtenu a partir du reactif Seyferth (PhHgCBr 3 ), et les alcenes electroniquement deficients est non立体特异性
Synthesis of Unsymmetrical Pyrazines Based on α-Diazo Oxime Ethers
作者:Nicole S. Y. Loy、Sunggak Kim、Cheol-Min Park
DOI:10.1021/ol5034173
日期:2015.2.6
Synthesis of unsymmetrically substituted pyrazines has been a challenge. The reactivity of α-imino carbenoids derived from α-diazo oxime ethers has been exploited for pyrazinesynthesis, in which the reaction of α-diazo oxime ethers with 2H-azirines provides highly substituted pyrazines in good to excellent yields.
Zn-ProPhenol Catalyzed Enantioselective Mannich Reaction of 2<i>H</i>-Azirines with Alkynyl Ketones
作者:Barry M. Trost、Chuanle Zhu
DOI:10.1021/acs.orglett.0c03737
日期:2020.12.18
The enantioselective Mannich reaction of 2H-azirines with alkynyl ketones is achieved under Zn-ProPhenol catalysis, delivering various aziridines with vicinal tetrasubstituted stereocenters in high yields with excellent enantioselectivities. The bimetallic Zn-ProPhenol complexes activate both the nucleophile and the electrophile in the same chiral pocket. A unique intramolecular hydrogen bond is observed