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

• flavin heteroarenes are observed. The structure of compound 1 in the solid state (Figure 2) shows an almost identical orientation of the flavin group to that of the acid 6. The acyl guanidinium ion group is almost planar and in a parallel orientation relative to the Kemp’s acid imide group. 2-D NMR

Transition- metal/Lewis acid free synthesis of acyl benzothiophenes via C-C bond forming reaction

• Sarbani Pal,
• Mohammad Ashrafuddin Khan,
• P. Bindu and
• P. K. Dubey

Beilstein J. Org. Chem. 2007, 3, No. 35, doi:10.1186/1860-5397-3-35

• Lewis acid/transition metal free synthesis of acyl benzothiophenes could provide an easy access to a library of benzothiophene based analogues of potential biological interest. Notably, while the use of various arenes/heteroarenes has been explored in the previous study, [25][26][27][28][29][30] the use

m-Iodosylbenzoic acid – a convenient recyclable reagent for highly efficient aromatic iodinations

• Andreas Kirschning,
• Mekhman S. Yusubov,
• Roza Y. Yusubova,
• Ki-Whan Chi and
• Joo Y. Park

Beilstein J. Org. Chem. 2007, 3, No. 19, doi:10.1186/1860-5397-3-19

• Table 2). Addition of aqueous H2SO4 accelerated the iodination of benzenes. For heteroarenes 7j and 7o this additive was not required and if an additional alcohol group was present (see 7n), addition of aqueous H2SO4 resulted in its oxidation. Compared to diacetoxyiodobenzene (DIB) 1a and its polymeric