Methanol → HCID 54053046, compound

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Reaction Steps

The resultant compound 29 (22.0 g) was added to 1000 ml methanol, and the mixture was refluxed with heat for 8 hours through use of 50 ml of conc. sulfuric acid. After completion of reaction, the reaction mixture was cooled, methanol evaporated, followed by extraction with ethyl acetate. The extract was washed with water, saturated sodium bicarbonate water, and saturated brine, and subsequently dried over sodium sulfate, and then evaporated. The resultant crude product was purified by silica gel column chromatography (chloroform), to thereby obtain 5.0 g (yield 21.9%) of the E-isomer of the title compound in the form of orange-colored crystals and 16.7 g (yield 73.2%) of the Z-isomer of the title compound in the form of yellow-colored crystals. The melting point and elementary analysis data are shown in Table 11, and NMR and MS spectrum data are shown in Table 12.

Provenance & Evidence