Synthesis of Isoquinoline Derivatives via Palladium‐Catalyzed C−H/C−N Bond Activation of
<i>N</i>
‐Acyl Hydrazones with
<i>α</i>
‐Substituted Vinyl Azides
A palladium‐catalyzed cyclization of N‐acetyl hydrazones with vinyl azides has been developed. Various substituted isoquinolines, including diverse fused isoquinolines can be prepared via this protocol in moderate to good yields. Mechanistic studies suggest that α‐substituted vinyl azide serves as an internal nitrogen source. Also, C−H bond activation and C−N bond cleavage have been realized using
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
Cerium(IV) ammonium nitrate promoted synthesis of O-phthalimide oximes from vinyl azides and N-hydroxyphthalimide
作者:Stanislav A. Paveliev、Liliya S. Alimkhanova、Anna V. Sergeeva、Alexander O. Terent'ev
DOI:10.1016/j.tetlet.2020.152533
日期:2020.11
O-Phthalimide oximes with an NON fragment were synthesized in high yields via the reaction of vinyl azides with phthalimide-N-oxyl radicals derived from N-hydroxyphthalimide under the action of cerium(IV) ammonium nitrate. The disclosed process is based on the radical transformation of vinyl azides with the elimination of nitrogen and the formation of iminyl N-radicals. The developed approach exploited
Copper-catalyzed [2+3]-annulation of N–H imines with vinyl azides: access to polyaryl 2<i>H</i>-imidazoles
作者:Zhongzhi Zhu、Hanze Lin、Baihui Liang、Junjie Huang、Wanyi Liang、Lu Chen、Yubing Huang、Xiuwen Chen、Yibiao Li
DOI:10.1039/c9cc10042c
日期:——
A practical method for the synthesis of 2H-imidazoles via a [2+3] annulation of N-H imines with vinylazides using a copper catalyst is developed. In this conversion, environmentally friendly oxygen is used as the sole oxidant and N2 and H2O are the only by-products. The catalytic transformation, operating under mild conditions, is operationally simple and is considered as a readily available catalytic
reaction of oximes with vinyl azides or homocoupling of oximes is reported. Oximes could serve as a directing group and an internal oxidant in the transformation. This reaction features good functional group tolerance and provides a useful protocol for the synthesis of different kinds of isoquinolines under mild conditions. Some control experiments and 15N isotope labeling experiments were conducted for