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 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
Synthesis of diarylmethylamines via palladium-catalyzed regioselective arylation of 1,1,3-triaryl-2-azaallyl anions
作者:Minyan Li、Baris Yücel、Javier Adrio、Ana Bellomo、Patrick J. Walsh
DOI:10.1039/c3sc53526f
日期:——
new methods for their synthesis are in demand. Herein, we report a versatile protocol for the synthesis of diarylmethylamine derivatives involving palladium-catalyzed arylation of in situ generated 2-azaallyl anion intermediates. The 2-azaallyl anions are generated by reversible deprotonation of readily available aldimine and ketimine precursors. Importantly, the arylated aldimine and ketimine products