Studies on antianaphylactic agents—I : A facile synthesis of 4-oxo-4H-1-benzopyran-3-carboxaldehydes by Vilsmeier reagents |
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| Authors: | A Nohara T Umetani Y Sanno |
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| Institution: | Medicinal Research Laboratories, Central Research Division, Takeda Chemical Industries, Juso, Higashiyodogawa-ku, Osaka, Japan |
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| Abstract: | By the application of the Vilsmeier-Haack reaction to various o-hydroxyacetophenone derivatives, 4-oxo-4H-1-benzopyran-3-carboxaldehydes were synthesized in one step. Their IR, NMR and mass spectra were studied. In the mass spectra characteristic fragmentation pathways were observed. |
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