Asymmetric hydrogenation of the C–C double bond of 1- and 1,2-methylated maleimides with cultured suspension cells of Marchantia polymorpha
作者:Mohamed-Elamir F. Hegazy、Kozo Shishido、Toshifumi Hirata
DOI:10.1016/j.tetasy.2006.06.030
日期:2006.7
Suspension cultured cells of Marchantia polymorpha have the potential to hydrogenate the C-C double bonds of 2-methyl- and 2,3-dimethylmaleimide derivatives to give enantiomerically pure (2R)-2-methyl- and (2R, 3R)-2, 3-dimethylsuccinimide derivatives, respectively. (c) 2006 Elsevier Ltd. All rights reserved.
Piutti, Gazzetta Chimica Italiana, 1910, vol. 40 I, # 548, p. 550
作者:Piutti
DOI:——
日期:——
Hydrogenations without Hydrogen: Titania Photocatalyzed Reductions of Maleimides and Aldehydes
A mild procedure for the reduction of electron-deficient alkenes and carbonyl compounds is described. UVA irradiations of substituted maleimides with dispersions of titania (Aeroxide P25) in methanol/acetonitrile (1:9) solvent under dry anoxic conditions led to hydrogenation and production of the corresponding succinimides. Aromatic and heteroaromatic aldehydes were reduced to primary alcohols in similar titania photocatalyzed reactions. A mechanism is proposed which involves two proton-coupled electron transfers to the substrates at the titania surface.