Chemo- and Diastereoselectivities in the Electrochemical Reduction of Maleimides
作者:Kathryn Rix、Geoffrey H. Kelsall、Klaus Hellgardt、King Kuok Mimi Hii
DOI:10.1002/cssc.201403184
日期:2015.2
The electrochemical cathodic reduction of cyclic imides (maleimides) to succinimides can be achieved chemoselectively in the presence of alkene, alkyne, and benzyl groups. The efficiency of the system was demonstrated by using a 3D electrode in a continuous flow reactor. The reduction of 3,4‐dimethylmaleimides to the corresponding succinimides proceeds with a 3:2 diastereomeric ratio, which is independent
Efficient asymmetric hydrogenation of the C–C double bond of 2-methyl- and 2,3-dimethyl-N-phenylalkylmaleimides by Aspergillus fumigatus
作者:Maximiliano Sortino、Susana Alicia Zacchino
DOI:10.1016/j.tetasy.2010.02.017
日期:2010.3
Eight N-phenylalkylmaleimides (four 2-methyl-N-phenylalkylmaleimides and four 2,3-dimethyl-N-phenylalkylmaleimides with an alkyl chain (CH(2))(n) (n = 1-4) between the imide N and the benzene ring) were subjected to biotransformation using the fungal strain Aspergillus fumigatus ATCC 26934. All compounds were reduced enantioselectively to their respective succinimides: (R)-2-methyl-N-phenylalkylsuccinimides and (2R,3R)-2,3-dimethyl-N-phenylalkylsuccinimides, with satisfactory conversion rates and high stereoisomeric excesses. NMR analysis using the chiral shift reagent Eu(hfc)(3) showed that enantiomeric excesses were >99%. (C) 2010 Elsevier Ltd. All rights reserved.