An efficient and practicalarenehydrogenation procedure based on the use of heterogeneous platinum group catalysts has been developed. Rh/C is the most effective catalyst for the hydrogenation of the aromatic ring, which can be conducted in iPrOH under neutral conditions and at ordinary to medium H2 pressures (<10 atm). A variety of arenes such as alkylbenzenes, benzoic acids, pyridines, furans, are
Reactions of stoichiometric higher order, mixed lithio magnesio organocuprates
作者:Bruce H. Lipshutz、David A. Parker、Sam L. Nguyen、Keith E. McCarthy、John C. Barton、Scott E. Whitney、Hiyoshizo Kotsuki
DOI:10.1016/s0040-4020(01)90576-9
日期:1986.1
2-lithiothiophene and RMgX. Reactions of various members of this new class of reagents are described, including substitution and conjugateaddition processes, where the ligand derived from the Grignard reagent is selectively transferred. The effects of added BF3.Et2O are discussed. Some comparison reactions with the corresponding lower order reagents, RCu(CN)MgBr, have also been carried out. Evidence is presented
More highly mixed, higher order cyanocuprates “RT(2-thienyl)Cu(CN)Li2”. Efficient reagents which promote selective ligand transfer
作者:Bruce H. Lipshutz、Joseph A. Kozlowski、David A. Parker、Sam L. Nguyen、Keith E. McCarthy
DOI:10.1016/0022-328x(85)87388-5
日期:1985.4
forms a new reagent, “RT(2-thienyl)Cu(CN)Li2.” This species selectively transfers the RT ligand in substitution reactions with epoxides and halides. In conjugateaddition processes, the cuprate reacts with unhindered substrates, while β,β-disubstituted cases unexpectedly afford products resulting from 1,2-addition of the thiophene group. The prospects for use of these reagents in the synthesis of polyene
有机锂(R T Li)和2-lithiothiophene(2-噻吩基)与CuCN的结合形成了一种新试剂“ R T(2-噻吩基)Cu(CN)Li 2”。该物种在与环氧化物和卤化物的取代反应中选择性转移R T配体。在共轭加成过程中,铜酸盐与不受阻碍的底物反应,而β,β-二取代的情况出乎意料地提供了由噻吩基的1,2-加成产生的产物。讨论了这些试剂在多烯大环内酯类抗生素合成中的应用前景。
Raney Ni–Al alloy-mediated reduction of alkylated phenols in water
Raney Ni–Al alloy in a dilute aqueous alkaline solution has been shown to be a very powerful reducing agent in the hydrogenation of phenol and alkylated phenols to the corresponding cyclohexanol derivatives.
Studies on bicyclononanes. Part IV. 2-Dialkylaminobicyclononan-9-ols and related compounds
作者:C. S. Dean、J. R. Dixon、S. H. Graham、D. O. Lewis
DOI:10.1039/j39680001491
日期:——
The stereochemistry of the 2-aminobicyclononan-9-ones and their reduction products is discussed, and fragmentation reactions of 9-hydroxybicyclononan-2-ylammonium salts are described. New observations are reported on the preparation of 5-carboxycyclo-octene.