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Beilstein J. Org. Chem. 2015, 11, 9–15, doi:10.3762/bjoc.11.2
Graphical Abstract
Scheme 1: Synthetic routes to 7,8-diaza[5]helicene.
Scheme 2: Oxidant-controlled transformations of BINAMs.
Scheme 3: Substrate scope of the oxidative ring-closure of BINAMs. Reaction conditions: 1 (0.1 mmol), t-BuOCl...
Scheme 4: Oxidative ring-closure of 3.
Scheme 5: A possible reaction pathway of the oxidative ring-closure of 1a.
Figure 1: UV–vis absorption spectra of 2a, 2b, 2d, and 2f.