(4S)-3-(4-aminophenyl)-4-methyl-4,5-dihydro-1H-pyridazin-6-one

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

Procedure: A mixture of (S)-6-(4-aminophenyl)-5-methyl-4,5-dihydro-3(2H)-pyridazinone (147 mg), 4H-pyran-4-one (78 mg) and hydrochloric acid (0.1 N, 1.5 ml) in water (2 ml) was stirred under reflux under nitrogen for 3 hours. The reaction mixture was cooled to afford the title compound, which was collected, washed with water and dried, 110 mg, m.p. 256-7° C. (softens 80° C.), [α]25D=+ 354° (1.03% in dimethylformamide). under reflux under nitrogen for 3 hours The reaction mixture was cooled

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

Procedure: A mixture of (S)-6-(4-aminophenyl)-5-methyl-4,5-dihydro-3(2H)-pyridazinone (147 mg), 4H-pyran-4-one (78 mg) and hydrochloric acid (0.1 N, 1.5 ml) in water (2 ml) was stirred under reflux under nitrogen for 3 hours. The reaction mixture was cooled to afford the title compound, which was collected, washed with water and dried, 110 mg, m.p. 256-7° C. (softens 80° C.), [α]25D=+ 354° (1.03% in dimethylformamide). under reflux under nitrogen for 3 hours The reaction mixture was cooled

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

Procedure: A mixture of (S)-6-(4-aminophenyl)-5-methyl-4,5-dihydro-3(2H)-pyridazinone (147 mg), 4H-pyran-4-one (78 mg) and hydrochloric acid (0.1N, 1.5 ml) in water (2 ml) was stirred under reflux under nitrogen for 3 hours. The reaction mixture was cooled to afford the title compound, which was collected, washed with water and dried, 110 mg, m.p. 256°-7° C. (softens 80° C.), [α]D25 =+354° (1.03% in dimethylformamide). under reflux under nitrogen for 3 hours The reaction mixture was cooled

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

Procedure: A mixture of (S)-6-(4-aminophenyl)-5-methyl-4,5-dihydro-3(2H)-pyridazinone (147 mg), 4H-pyran-4-one (78 mg) and hydrochloric acid (0.1N, 1.5 ml) in water (2 ml) was stirred under reflux under nitrogen for 3 hours. The reaction mixture was cooled to afford the title compound, which was collected, washed with water and dried, 110 mg, m.p. 256°-7° C. (softens 80° C.), [α]D25 =+354° (1.03% in dimethylformamide). under reflux under nitrogen for 3 hours The reaction mixture was cooled

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

Procedure: A mixture of (S)-6-(4-aminophenyl)-5-methyl-4,5-dihydro-3(2H)-pyridazinone (147 mg), 4H-pyran-4-one (78 mg) and hydrochloric acid (0.1N, 1.5 ml) in water (2 ml) was stirred under reflux under nitrogen for 3 hours. The reaction mixture was cooled to afford the title compound, which was collected, washed with water and dried, 110 mg, m.p. 256°-7° C. (softens 80° C.), [α]D25 =+354° (1.03% in dimethylformamide). under reflux under nitrogen for 3 hours The reaction mixture was cooled

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

Procedure: A mixture of (S)-6-(4-aminophenyl)-5-methyl-4,5-dihydro-3(2H)-pyridazinone (147 mg), 4H-pyran-4-one (78 mg) and hydrochloric acid (0.1 N, 1.5 ml) in water (2 ml) was stirred under reflux under nitrogen for 3 hours. The reaction mixture was cooled to afford the title compound, which was collected, washed with water and dried, 110 mg, m.p. 256-7° C. (softens 80° C.), [α]25D=+ 354° (1.03% in dimethylformamide). under reflux under nitrogen for 3 hours The reaction mixture was cooled

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

Procedure: A mixture of (S)-6-(4-aminophenyl)-5-methyl-4,5-dihydro-3(2H)-pyridazinone (147 mg), 4H-pyran-4-one (78 mg) and hydrochloric acid (0.1N, 1.5 ml) in water (2 ml) was stirred under reflux under nitrogen for 3 hours. The reaction mixture was cooled to afford the title compound, which was collected, washed with water and dried, 110 mg, m.p. 256°-7° C. (softens 80° C.), [α]D25 =+354° (1.03% in dimethylformamide). under reflux under nitrogen for 3 hours The reaction mixture was cooled