The preparation of the title compound (1a) is described. Effects of C-2 methyl groups on ring opening and alkylation of chroman-4-ones under basic conditions are discussed. The reaction of hydrazine with 3-ethoxycarbonyl-7-methoxy-2,2-dimethylchromen (1d) and 3-ethoxycarbonyl-7-methoxy-2,2-dimethylchroman-4-one (3f) failed to give the pyrazolidinone or pyrazolinone.
P. Anastasis and P. E. Brown, J. Chem. Soc., Perkin Trans. 1, 1983, 197 DOI: 10.1039/P19830000197
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