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Synthetic procedure for compounds 7a1–7, 7b1–7.
Reagents and conditions: (a) sodium, absolute methanol; (b) ethyl chloroacetate, ethanol:DMFA, heating 7 h; (c) hydrazine hydrate, ethanol, heating 6 h; (d) phenyl isothiocyanate/4-chlorophenyl isothiocyanate, 1,4-dioxane:DMFA, heating 6 h; (e) chloroacetyl chloride, methanol:chloroform, heating 10 h; (f) aromatic aldehydes, 1,4-dioxane, piperidine, heating 6 h.
