Reaction of the title compound 2 with a variety of alkylating agents regioselectively gave, depending on the reaction conditions used, 4-alkylated compound 3 or 6-alkylated compound 4, which were further alkylated to afford the dialkylated compounds 5–7 in similar ways.
K. Konno, Y. Kawakami, T. Hayashi and H. Takayama, J. Chem. Soc., Perkin Trans. 1, 1994, 1371 DOI: 10.1039/P19940001371
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