Highly enantioselective hydrogenation of N-phthaloyl enamides
摘要:
Rh- or Ru-catalyzed highly enantioselective hydrogenation of N-phthaloyl enamides is presented. Electron-rich Tang-Phos and DuanPhos are found to be effective ligands for Rh-catalyzed hydrogenation of alpha-aryl enamides and up to 99% ee has been achieved. In contrast, for the hydrogenation of alpha-alkyl enamide.. the Ru-C-3-TunePhos complex is more effective and up to 69% ee can be observed. This work is the first report of the hydrogenation of N-phthaloyl enamides. (c) 2005 Elsevier Ltd. All rights reserved.
A facile approach to β-amino acid derivatives via palladium-catalyzed hydrocarboxylation of enimides with formic acid
作者:Jie Dai、Wenlong Ren、Haining Wang、Yian Shi
DOI:10.1039/c5ob01304f
日期:——
An effective Pd(0)-catalyzed hydrocarboxylation of enimides with formicacid in the presence of a catalytic amount of HCOOPh is described. A variety of β-amino acid derivatives are obtained in good yields with high regioselectivities without using external toxic CO gas.
A Convenient Method for the Synthesis of α-Imidostyrenes from Styrenes and Imides via Diphenylstyrylsulfonium Salts
作者:Hiroyuki Yamanaka、Teruaki Mukaiyama
DOI:10.1246/cl.2003.1192
日期:2003.12
thanesulfonyloxy)sulfonium triflate (1) to form diphenylstyrylsulfonium triflates 2 that were in turn converted into the corresponding α-imidostyrenes on treatment with sodium or potassium salts of cyclicimides.
Studies on Pd-catalyzed asymmetric hydroesterification of enimides. A possible approach to optically active β-amino acid derivatives
作者:Junhua Li、Yan Yang、Zichu Wang、Yian Shi
DOI:10.1039/d2nj01027e
日期:——
enimides with phenyl formate is described. A DIOP-based system has been found to be a highly active catalyst, giving the corresponding β-amino esters with up to 98% yield and up to 83 : 17 er. The resulting amino ester can be readily converted to an optically active β-aminoacid in high yield.
Expedient access to <i>N</i>-alkylphthalimides <i>via</i> redox-neutral photocatalysed Giese-type reactions
作者:Xiaoping Jin、Li Zhang
DOI:10.1039/d2ob00769j
日期:——
the preparation of N-alkylphthalimides has been successfully developed via the reactions of N-vinylphthalimides with radicals using alkyl silicates or Hantzsch esters as the radical precursors. According to the result of deuteration experiments, a mechanism involving a radical addition/SET reduction/protonation process has been proposed. The synthetic application of N-alkylphthalimide has also been demonstrated