Epithiochlorohydrin → 11-hydroxy-9-(thiiran-2-ylmethoxy)-12H-benzo[a]xanthen-12-one

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9,11-dihydroxy-12H-benzo[a]xanthen-12-one (0.1 g, 0.18 mmol) prepared in Step 1 of Examples 14 and 15, CS2CO3 (0.36 g, 0.54 mmol), and anhydrous acetone (13 mL) were charged to a dry round-bottom flask, and epithiochlorohydrin (0.2 g, 1.08 mmol) dissolved in anhydrous acetone (2 mL) was added thereto with stirring. The reaction mixture was stirred with reflux overnight at a temperature of 55 to 60° C. under a nitrogen atmosphere. Solid of the reaction mixture was filtered, removed and concentrated under reduced pressure. The resulting residue was separated and purified by silica gel column chromatography (developing solvent: ethyl acetate:n-hexane=1:3 (v/v)) to give a yellow solid compound 11-hydroxy-9-(thiiran-2-ylmethoxy)-12H-benzo[a]xanthen-12-one (27.3 mg, 21.7%) and a yellow solid compound 9,11-bis(thiiran-2-ylmethoxy)-12H-benzo[a]xanthen-12-one (31.2 mg, 20.5%).

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