(4S)-4-benzyl-1,3-thiazolidine-2-thione

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

Procedure: To a solution of (4S)-4-benzyl-1,3-thiazolidine-2-thione (38 g) in dichloromethane (350 mL) cooled to 0° C., propylene oxide (12.7 mL) and trifluoroacetic acid (14 mL) were added. After stirring the reaction mixture for 2 hours, the solvents were evaporated under reduced pressure to obtain a residue which was purified by column chromatography over silica gel using 20% ethyl acetate in hexane as eluant to afford the title compound (0.9 g). the solvents were evaporated under reduced pressure to obtain a residue which was purified by column chromatography over silica gel using 20% ethyl acetate in hexane as eluant

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

Procedure: To a solution of (4S)-4-benzyl-1,3-thiazolidine-2-thione (38 g) in dichloromethane (350 mL) cooled to 0° C., propylene oxide (12.7 mL) and trifluoroacetic acid (14 mL) were added. After stirring the reaction mixture for 2 hours, the solvents were evaporated under reduced pressure to obtain a residue which was purified by column chromatography over silica gel using 20% ethyl acetate in hexane as eluant to afford the title compound (0.9 g). the solvents were evaporated under reduced pressure to obtain a residue which was purified by column chromatography over silica gel using 20% ethyl acetate in hexane as eluant

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

Procedure: To a solution (4S)-4-benzyl-1,3-thiazolidine-2-thione (38 g) in dichloromethane (350 mL), cooled to 0° C. was added propylene oxide (12.7 mL) and trifluoroacetic acid (14 mL). After stirring the reaction mixture for 2 hours, the solvents were evaporated under reduced pressure to obtain a residue which was purified by column chromatography over silica gel using 20% ethylacetate in hexane as eluant to afford the title compound (0.9 g). Mass (m/z): 194.18 the solvents were evaporated under reduced pressure to obtain a residue which was purified by column chromatography over silica gel using 20% ethylacetate in hexane as eluant

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

Procedure: To a solution of (4S)-4-benzyl-1,3-thiazolidine-2-thione (38 g) in dichloromethane (350 mL) cooled to 0° C., propylene oxide (12.7 mL) and trifluoroacetic acid (14 mL) were added. After stirring the reaction mixture for 2 hours, the solvents were evaporated under reduced pressure to obtain a residue which was purified by column chromatography over silica gel using 20% ethyl acetate in hexane as eluant to afford the title compound (0.9 g). Mass (m/z): 194.18 the solvents were evaporated under reduced pressure to obtain a residue which was purified by column chromatography over silica gel using 20% ethyl acetate in hexane as eluant