Asymmetric induction in diarylcarbene cyclopropanations
作者:Laren M. Tolbert、Mahfuza B. Ali
DOI:10.1021/ja00301a058
日期:1985.7
Cyclopropanation de divers fumarates par le diphenylmethylene ou le fluorenylidene a l'etat triplet. Proposition d'un mecanisme non concerte avec une premiere etape reversible
Cyclopropanation de divers Fumarates par le diphenylmethylene ou le fluorenylidene a l'etat 三重峰。Proposition d'un mecanisme non Concerte avec une Premiere etape reversible
Stereoselective Hydrolysis of Substituted Cyclopropanedicarboxylates with Pig Liver Esterase
作者:Paula Walser、Peter Renold、Victor N'Goka、Fatemeh Hosseinzadeh、Christoph Tamm
DOI:10.1002/hlca.19910740832
日期:1991.12.11
hydrolysis of the meso-cyclopropane-1,2-dicarboxylates 1a-3a, 4, 5a, 6a, and 9, containing various substituents at C(3), and of the rac-3-phenylcyclopropane-1,2-dicarboxylates7a, 8a, and 10 with pigliveresterase (PLE) is described. The stereoselectivtty and absolute configurations of the products were determined. An interpretation of results was attempted on the basis of a recent active-site model for
Cyclopropane Formation by Copper-Catalysed Indirect Electroreductive Coupling of Activated Olefins and Activated α,α,α-Trichloro or Gem-Dichloro Compounds
作者:S. Sengmany、E. Léonel、J. P. Paugam、J.-Y. Nédélec
DOI:10.1055/s-2002-20969
日期:——
electroreductive coupling ol activatedolefins and activated α,α,α-trichloro or gem-dichloro compounds (Cl 3 CCO 2 Me, PhCCl 3 . Ph 2 CCl 2 , PhCHCl 2 ). This process,using a copper complex in catalytic amountss is convenient for the reagent couple activatedolefin/ activated polyhalide, whatever the reduction potential of each reagent relative to each other. The main advantage of our electrochemical process
A highly selective hydroboration of unsymmetrical internalalkynes featuring unique regioselectivity, broad substrate scope and good functional group compatibility was realized by using cobalt catalysts modified with newly developed cyclopropane-based diphosphine ligands. The current protocol enabled the synthesis of novel alkenyl borates and improved the synthetic efficiency of bioactive compounds