5-[(4-aminophenyl)methyl]-3-methyl-1,3-thiazolidine-2,4-dione

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

Procedure: A mixture of 3-methyl-5-(4-nitrobenzylidene)-1,3-thiazolidine-2,4-dione (1.0 g), 5% palladium carbon (1.0 g) and tetrahydrofuran (150 mL) was subjected to catalytic reduction under hydrogen pressure of 5.0 kgf·cm−2. The catalyst was removed by filtration, and the filtrate was concentrated to give 5-(4-aminobenzyl)-3-methyl-1,3-thiazolidine-2,4-dione as colorless crystals (0.71 g, yield 79%). Recrystallization thereof from ethyl acetate-hexane gave colorless prism crystals. melting point: 91-92° C. The catalyst was removed by filtration the filtrate was concentrated

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

Procedure: A mixture of 3-methyl-5-(4-nitrobenzylidene)-1,3-thiazolidine-2,4-dione (1.0 g), 5% palladium carbon (1.0 g) and tetrahydrofuran (150 mL) was subjected to catalytic reduction under hydrogen pressure of 5.0 kgf·cm−2. The catalyst was removed by filtration, and the filtrate was concentrated to give 5-(4-aminobenzyl)-3-methyl-1,3-thiazolidine-2,4-dione as colorless crystals (0.71 g, yield 79%). Recrystallization thereof from ethyl acetate-hexane gave colorless prism crystals. melting point: 91-92° C. The catalyst was removed by filtration the filtrate was concentrated

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

Procedure: A mixture of 3-methyl-5-(4-nitrobenzylidene)-1,3-thiazolidine-2,4-dione (1.0 g), 5% palladium carbon (1.0 g) and tetrahydrofuran (150 mL) was subjected to catalytic reduction under hydrogen pressure of 5.0 kgf·cm−2. The catalyst was removed by filtration, and the filtrate was concentrated to give 5-(4-aminobenzyl)-3-methyl-1,3-thiazolidine-2,4-dione as colorless crystals (0.71 g, yield 79%). Recrystallization thereof from ethyl acetate-hexane gave colorless prism crystals. melting point: 91-92° C. The catalyst was removed by filtration the filtrate was concentrated