2-(chloromethyl)thiirane

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Epithiochlorohydrine (268 mg, 2.40 mmol, 1.0 eq) is added at room temperature to a stirred solution of piperidin-4-yl-carbamic acid tert-butyl ester (500 mg, 2.40 mmol, 1.0 eq) in N,N-dimethylformamide (15 mL), followed by potassium carbonate (335 mg, 2.40 mmol, 1.0 eq). After 24 hours stirring at room temperature, solvent is evaporated and the residue is extracted with dichloromethane (3×20 mL) and water (20 mL). The combined organic layers are dried over sodium sulfate, filtered and concentrated to afford (1-thiiranylmethyl-piperidin-4-yl)-carbamic acid tert-butyl ester as a white solid (745 mg, 57% yield). solvent is evaporated the residue is extracted with dichloromethane (3×20 mL) and water (20 mL) The combined organic layers are dried over sodium sulfate filtered concentrated

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Epithiochlorohydrine (268 mg, 2.40 mmol, 1.0 eq) is added at room temperature to a stirred solution of piperidin-4-yl-carbamic acid tert-butyl ester (500 mg, 2.40 mmol, 1.0 eq) in N,N-dimethylformamide (15 mL), followed by potassium carbonate (335 mg, 2.40 mmol, 1.0 eq). After 24 hours stirring at room temperature, solvent is evaporated and the residue is extracted with dichloromethane (3×20 mL) and water (20 mL). The combined organic layers are dried over sodium sulfate, filtered and concentrated to afford (1-thiiranylmethyl-piperidin-4-yl)-carbamic acid tert-butyl ester as a white solid (745 mg, 57% yield). solvent is evaporated the residue is extracted with dichloromethane (3×20 mL) and water (20 mL) The combined organic layers are dried over sodium sulfate filtered concentrated

Conditions: temp:57.51; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 1,3-dihydroxy-12H-benzo[b]xanthen-12-one (0.05 g, 0.18 mmol) synthesized in Step 1 of Example 18, K2CO3 (0.07 g, 0.54 mmol), and anhydrous acetone (18 mL) were charged to a dry round-bottom flask. Under stirring, epithiochlorohydrin (0.07 g, 0.72 mmol) dissolved in anhydrous acetone (2 mL) was added thereto. The reaction liquid was stirred with reflux at a temperature of 55 to 60° C. under a nitrogen atmosphere (overnight). Solid of the reaction mixture was filtered and removed, and the filtrate was 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 the title compound (13.1 mg, 20.8%) as a yellow solid. was added The reaction liquid was stirred Solid of the reaction mixture was filtered removed the filtrate was concentrated under reduced pressure The resulting residue was separated purified by silica gel column chromatography (developing solvent: ethyl acetate:n-hexane=1:3 (v/v))

Conditions: temp:57.51; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 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%). was added The reaction mixture was stirred Solid of the reaction mixture was filtered removed concentrated under reduced pressure The resulting residue was separated purified by silica gel column chromatography (developing solvent: ethyl acetate:n-hexane=1:3 (v/v))

Conditions: temp:50.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of epithiochlorohydrin (6.48 g) in toluene (60 mL) were added water (60 mL) and pyridine (23.7 g). The resulting mixture was stirred at 50° C. for 16 h. The two phases were separated and the aqueous phase was then lyophilized to give a yellow oil (13.2 g). The crude oil was filtered over a plug of silica gel, eluting with EtOH:H2O (100:0 to 95:5). The desired salt was obtained as an amber solid was obtained (6.1 g). 1H-NMR (D2O, 500 MHz): 3.59 (t, 2H), 3.91 (t, 2H), 5.99 (dt, 2H), 8.00 (m, 2H), 8.47 (m, 1H), 8.86 (m, 2H). 13C-NMR (D2O, 125 MHz): 32.6 (2C), 63.8, 128.1 (2C), 141.7, 146.5 (2C). The two phases were separated

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Epithiochlorohydrine (268 mg, 2.40 mmol, 1.0 eq) is added at room temperature to a stirred solution of piperidin-4-yl-carbamic acid tert-butyl ester (500 mg, 2.40 mmol, 1.0 eq) in N,N-dimethylformamide (15 mL), followed by potassium carbonate (335 mg, 2.40 mmol, 1.0 eq). After 24 hours stirring at room temperature, solvent is evaporated and the residue is extracted with dichloromethane (3×20 mL) and water (20 mL). The combined organic layers are dried over sodium sulfate, filtered and concentrated to afford (1-thiiranylmethyl-piperidin-4-yl)-carbamic acid tert-butyl ester as a white solid (745 mg, 57% yield). solvent is evaporated the residue is extracted with dichloromethane (3×20 mL) and water (20 mL) The combined organic layers are dried over sodium sulfate filtered concentrated

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Epithiochlorohydrine (268 mg, 2.40 mmol, 1.0 eq) is added at room temperature to a stirred solution of piperidin-4-yl-carbamic acid tert-butyl ester (500 mg, 2.40 mmol, 1.0 eq) in N,N-dimethylformamide (15 mL), followed by potassium carbonate (335 mg, 2.40 mmol, 1.0 eq). After 24 hours stirring at room temperature, solvent is evaporated and the residue is extracted with dichloromethane (3×20 mL) and water (20 mL). The combined organic layers are dried over sodium sulfate, filtered and concentrated to afford (1-thiiranylmethyl-piperidin-4-yl)-carbamic acid tert-butyl ester as a white solid (745 mg, 57% yield). solvent is evaporated the residue is extracted with dichloromethane (3×20 mL) and water (20 mL) The combined organic layers are dried over sodium sulfate filtered concentrated