Synergistic combination of visible-light photo-catalytic electron and energy transfer facilitating multicomponent synthesis of β-functionalized α,α-diarylethylamines
作者:Yanan Wu、Yipin Zhang、Mingjie Jiang、Xunqing Dong、Hitesh B. Jalani、Guigen Li、Hongjian Lu
DOI:10.1039/c9cc02465d
日期:——
combination of electron and energy transfer processes has been developed. The mild reaction conditions allow the radical–radical cross-coupling phenomenon for the multicomponent synthesis of β-arylsulfonyl(diarylphosphinoyl)-α,α-diarylethyl-amines from readily available arylsulfinic acids (diarylphosphine oxides), 1,1-diarylethylenes and arylazides.
Pd-Catalyzed Oxidative Heck Reaction of Grignard Reagents with Diaziridinone as Oxidant
作者:Qipu Dai、Baoguo Zhao、Yihui Yang、Yian Shi
DOI:10.1021/acs.orglett.9b01762
日期:2019.7.5
A novel Pd-catalyzed oxidative Heckreaction with readily available Grignard reagents using di-t-butyldiaziridinone as an oxidant has been developed. Various substituted olefins were obtained in 46–91% yields with high regioselectivity under mild reaction conditions.
styrene and vinylarenes, the aryl and vinyl groups routinely insert at the β position. However, selective insertion at the αposition has been very rare. Herein, we provide a missing piece in the palette of Heck reaction, which gave >20:1 αselectivity. The key to our success is a new ferrocene 1,1′‐bisphosphane (dnpf) that carries 1‐naphthyl groups. Our mechanistic studies revealed that the high α selectivity
A mild and efficient approach for highly regio- and enantioselective copper-catalyzed hydroboration of 1,1-diaryl substituted alkenes with bis(pinacolato)diboron (B2Pin2) was developed for the first time, providing facile access to a series of valuable β,β-diaryl substituted boronic esters with high enantiomeric purity. Moreover, this approach could also be suitable for hydroboration of α-alkyl styrenes
Synthesis and Characterization of Pd(II) and Ru(II) Complexes of Tetradentate N,N,N,N-(Diphosphinomethyl)amine Ligands: Catalytic Properties in Transfer Hydrogenation and Heck Coupling Reactions
作者:Serhan Uruş、Mustafa Keleş、Seda Köşker Akkaya
DOI:10.3987/com-20-14260
日期:——
Tetradentate N,N,N,N-(diphosphinomethyl)amine ligands and their Pd(II) and Ru(II) complexes were synthesized under a nitrogen atmosphere using Schlenk technique. The synthesized ligands and the complexes were characterized with H-1- and P-31-NMR, FT-IR, TG/DTA, and elemental analysis techniques. Pd(II) Complexes were used as catalysts in Heck coupling reactions and Ru(II) complexes were tried in transfer hydrogenation reactions of acetophenone derivatives. According to the results, L4-Pd(II) complex showed the best catalytic activity in the Heck coupling reaction of p-methylbromobenzene with o-chlorostyrene. It was confirmed that the reduction of bromo and chloroacetophenones in all catalysts the conversions were higher. The results showed that Ru(II) complexes as efficient catalysts and up to 99% conversions was occurred with bromo and chloro acetophenones in K2CO3/isopropyl alcohol media at 80 degrees C.