Transition-metal-free chemo- and regioselective vinylation of azaallyls
作者:Minyan Li、Osvaldo Gutierrez、Simon Berritt、Ana Pascual-Escudero、Ahmet Yeşilçimen、Xiaodong Yang、Javier Adrio、Georgia Huang、Eiko Nakamaru-Ogiso、Marisa C. Kozlowski、Patrick J. Walsh
DOI:10.1038/nchem.2760
日期:2017.10
regioselective coupling protocol between 3-aryl-substituted-1,1-diphenyl-2-azaallyl derivatives and vinyl bromides has been developed. This is the first transition-metal-free cross-coupling of azaallyls with vinyl bromide electrophiles and delivers allylic amines in excellent yields (up to 99%). This relatively simple and mild protocol offers a direct and practical strategy for the synthesis of high-value
Synthesis of (diarylmethyl)amines using Ni-catalyzed arylation of C(sp<sup>3</sup>)–H bonds
作者:José A. Fernández-Salas、Enrico Marelli、Steven P. Nolan
DOI:10.1039/c5sc01589h
日期:——
The first nickelcatalyzed deprotonative cross coupling between C(sp3)-H bonds and aryl chlorides is reported, allowing the challenging arylation of benzylimines in the absence of directing group or stoichiometric metal...
synthesis is generally limited to cyclization of phenyl propargyl ether precursors under transition metal catalyzed conditions. Herein, we present a novel disconnection that rapidly constructs isochromene derivativesthrough a cascade radicalcyclization strategy. Generation of aryl radicals by SET reduction of 2‐iodo benzyl allenyl ethers is followed by radicalcyclization to construct the isochromene
A unique C(sp3)–H/C(sp3)–H dehydrocoupling of N-benzylimines with saturated heterocycles is described. Using super electron donor (SED) 2-azaallyl anions and aryl iodides as electron acceptors, single-electron-transfer (SET) generates an aryl radical. Hydrogen atom transfer (HAT) from saturated heterocycles or toluenes to the aryl radical generates alkyl radicals or benzylic radicals, respectively
Transition Metal‐Free Synthesis of α‐Aminophosphine Oxides through C(
<i>sp</i>
<sup>3</sup>
)−P Coupling of 2‐Azaallyls
作者:Jing Wang、Guogang Deng、Chunxiang Liu、Zhuo Chen、Kaili Yu、Wen Chen、Hongbin Zhang、Xiaodong Yang
DOI:10.1002/adsc.201901553
日期:2020.5.26
metal‐free C(sp 3)−P bond formation to prepare α‐aminophosphine oxides via deprotonative radical coupling processes of 2‐azaallyls with chlorodiphenylphosphineoxides was presented. Deprotonation of N ‐benzyl imines may generate super‐electron‐donor (SED) 2‐azaallyl anions that reduced chlorodiphenylphosphineoxides to phosphineoxide radicals. Single‐electron transfer (SET) process transformed the