Diencarbonsäuren aus 1,3-dienen und CO2 durch C-C-verknüpfung an nickel(0)
作者:H. Hoberg、D. Schaefer、B.W. Oster
DOI:10.1016/0022-328x(84)80144-8
日期:1984.5
react with 1,3-dienes in the presence of CO2 to give nickela carboxylates. The influence of ligands and temperature on the regioselectivity of the CC bond formation is elucidated. In some cases the nickela carboxylates undergo reductive elimination under the influence of maleicanhydride, and the coupled diene/CO2 moiety rearranges to give the diene carboxylic acid. A possible reaction sequence is
(Lig)Ni 0系统在CO 2的存在下与1,3-二烯反应生成羧酸镍。阐明了配体和温度对CC键形成区域选择性的影响。在某些情况下,镍的羧酸盐在马来酸酐的影响下经历还原消除,并且偶合的二烯/ CO 2部分重排以得到二烯羧酸。讨论了可能的反应顺序。
Synthesis of Optically Active α-Methyl β-Hydroperoxy Esters by Diastereoselective Singlet Oxygen Ene Reaction and Horseradish Peroxidase Catalyzed Kinetic Resolution
作者:Waldemar Adam、Chantu R. Saha-Möller、Oliver Weichold
DOI:10.1007/s007060070098
日期:2000.6.15
Optically active diastereomeric β-hydroperoxy esters 4 have been prepared by singletoxygenenereaction of β,γ-unsaturated esters 3 and subsequent horseradish peroxidase (HRP) catalyzed kinetic resolution of the eneproduct. The highest enantiomeric excess (up to 95%) has been obtained for the isopropyl ester threo - 4c , which establishes that the size of the remote ester functionality exercises