Search results

Search for "maleimide" in Full Text gives 77 result(s) in Beilstein Journal of Organic Chemistry.

Synthesis of rigidified flavin–guanidinium ion conjugates and investigation of their photocatalytic properties

  • Harald Schmaderer,
  • Mouchumi Bhuyan and
  • Burkhard König

Beilstein J. Org. Chem. 2009, 5, No. 26, doi:10.3762/bjoc.5.26

Graphical Abstract
  • for the cycloaddition of maleimide to anthracene in toluene (Scheme 5). Table 3 summarizes the results. A significantly higher yield of the cycloaddition product was obtained after 8 h at 40 °C in the presence of compound 2 (entry 3), if compared to the control reaction (entry 6). Upon irradiation
  • reaction (entry 4). Blue light irradiated flavins accelerate the anthracene maleimide cycloaddition significantly, but flavins 1 and 2 do not provide additional benefit if compared to tetraacetyl flavin 3. Conclusion We have prepared new flavin derivatives that bear an acyl guanidinium group, which is
PDF
Album
Supp Info
Full Research Paper
Published 28 May 2009

C2-symmetric bisamidines: Chiral Brønsted bases catalysing the Diels- Alder reaction of anthrones

  • Deniz Akalay,
  • Gerd Dürner,
  • Jan W. Bats and
  • Michael W. Göbel

Beilstein J. Org. Chem. 2008, 4, No. 28, doi:10.3762/bjoc.4.28

Graphical Abstract
  • compounds 2 could be introduced by a Mitsunobu alkylation of maleimide [12]. Alternatively, substituted maleimides were prepared by reaction of maleic anhydride with the corresponding amines followed by ring closure [13][14]. Cycloaddition kinetics of 1a and 2a was examined first by 1H NMR in CD2Cl2 at room
  • yields and with moderate values of ee. A remarkable increase in enantioselectivity was observed using maleimide 2i. The steric hindrance imposed by the large 2,6-diisopropylphenyl moiety of 2i resulted in 76% ee at −70 °C but also lowered reaction rates. Only 13% yield could be obtained under such
PDF
Album
Supp Info
Full Research Paper
Published 07 Aug 2008
Other Beilstein-Institut Open Science Activities