Abstract
A method for the synthesis of the previously unknown 3-aryl-substituted 6,7-dimethoxy-2-benzopyrylium salts with a free α position by the formylation of 3,4-dimethoxydeoxybenzoins with butyl dichloromethyl ether in the presence of anhydrous AlCl3 has been developed. The pyrylium salts, which were isolated in high yield in the form of stable perchlorates, readily exchange their heteroatom for nitrogen under the action of aqueous ammonia.
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A. Rieche, H. Gross, and E. Hoft, Ber., 93, 88 (1960)
G. N. Dorofeenko and G. P. Safaryan, KhGS [Chemistry of Heterocyclic Compounds ], 6, 585 (1970).
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E. V. Kuznetsov and G.N. Dorofeenko, KhGS [Chemistry of Natural Compounds], 6, 1011 (1970).
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, Vol. 6, No. 7, pp. 1013–1014, August, 1970.
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Dorofeenko, G.N., Safaryan, G.P. & Kuznetsov, E.V. Synthesis of 3-aryl-substituted 2-benzopyrylium salts with a free α position. Chem Heterocycl Compd 6, 941–942 (1970). https://doi.org/10.1007/BF00480617
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DOI: https://doi.org/10.1007/BF00480617