2-benzopyrylium salts. xxxi : Analogs of reissert compounds from 2-benzopyrylium salts and sodium cyanide |
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| Institution: | 1. Research Reactor Institute, Kyoto University, Kumatori, Osaka 590-0494, Japan;2. Radioisotope Research Center, Teikyo University, Kaga Itabashi-ku, Tokyo 173-8605, Japan;3. Faculty of Pharmaceutical Sciences, Himeji Dokkyo University, Kamiohno, Himeji 670-8524, Japan;4. Tokyo University of Pharmacy and Life Sciences, Hachiouji, Tokyo 192-0392, Japan |
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| Abstract: | Nucleophilic addition of a cyanide anion to 2-benzopyrylium salts I takes place at the first position and leads to stable isochromenes II, which are oxygen analogs of Reissert compounds. The structure II was confirmed by IR, 1H-NMR and 13C-NMR spectra. The latter spectra reveal clearly the cyano group (which does not yield any observable stretching band) and give evidence for diastereotopic isopropyl carbons (unlike 1H-NMR spectra). |
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