Ethyl Acetate → 1-{6-[(4-Nitrophenyl)-(pyrimidin-2-yl-hydrazono)-methyl]-benzo-1,3-dioxol-5-yl}-propan-2-ol

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반응 단계

A stirred mixture of 3.29 g (9.99 mmol) of (±)-7-methyl-5-(4-nitrophenyl)-7,8-dihydro-5H-[1,3]dioxolo[4,5-g]isochroman-5-ol, 40 ml of ethyl acetate and 1.0 ml (1.15 mmol) perchloric acid was refluxed for 1 h. After cooling the precipitated (±)-7-methyl-5-(4-nitrophenyl)-7,8-dihydro-[1,3]dioxolo[4,5-g]isochromen-6-ylium perchlorate was filtered off, and it was stirred at reflux temperature with 1.6 g (14.55 mmol) of 2-hydrazinopyrimdine in 50 ml of isopropanol for 2 h, then concentrated. The residue was dissolved in dichloromethane and washed several times with water. After drying and evaporation the crude product was purified by column chromatography using silica gel (MN Kieselgel 60) as adsorbent and a mixture of toluene-ethyl acetate (0.1:4) as eluent to yield 2.71 g (64%) of the title compound; Mp.: 125-127° C.

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