1-amino-3-methylthiourea

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

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

Procedure: 5 g of methoxy-acetic acid (55.5 mmol) were dissolved in 70 ml of dimethylformamide. 11.73 g of 1,1′-carbonyldiimidazol (72.3 mmol) were added in portions within 10 min. After 30 min. at room temperature 23 ml of pyridine were added. Then 5.84 g of 4-methyl-3-thiosemicarbazide (55.5 mmol) were added and the obtained solution was stirred at room temperature overnight, and for an additional 3 h at 100° C. The solvent was evaporated, the residue dissolved in 70 ml of saturated aqueous sodium chloride solution and 30 ml of water. The aqueous layer was extracted six times with 100 ml of ethyl acetate each, and the combined organic layers were dried over magnesium sulfate, filtered, and the solvent was evaporated to dryness to yield 17 g of the crude title compound, which was further purified by silica gel chromatography with ethyl acetate, thereby obtaining 7.1 g of the purified title compound. for an additional 3 h at 100° C The solvent was evaporated the residue dissolved in 70 ml of saturated aqueous sodium chloride solution The aqueous layer was extracted six times with 100 ml of ethyl acetate each, and the combined organic layers were dried over magnesium sulfate filtered the solvent was evaporated to dryness

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

Procedure: A solution of 5.0 g N-ethyl-N[3-(6-chloro-3-pyridazinyl)phenyl]propanamide and 3.8 g of 4-methylthiosemicarbazide in 200 ml ethanol was refluxed for 18 hours. The mixture was then treated and the product chromatographed as described for Example 70. Recrystallization of the product from acetone-hexane afforded 0.5 g orange crystals, mp 172°°-173° C. The mixture was then treated the product chromatographed Recrystallization of the product from acetone-hexane

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

Procedure: A solution of 7.0 g N-ethyl-N-[3-(6-chloro-3-pyridazinyl) phenyl]acetamide and 5.3 g 4-methyl thiosemicarbazide in 200 ml ethanol was refluxed for 18 hours. The mixture was worked up and the product chromatographed as described in Example 70. Recrystalization of the product fractions from dichloromethone-hexane afforded 2.1 g of yellow crystals, mp 193°-195° C. the product chromatographed Recrystalization of the product fractions from dichloromethone-hexane

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

Procedure: A solution of 6.0 g N-methyl-N-[3-(6-chloro-3-pyridazinyl)phenyl]acetamide and 4.8 g 4-methylthiosemicarbazide in 200 ml ethanol was refluxed for 5 hours and treated in similar fashion to Example 67. Chromatography on silica gel with dichloromethane-methanol (96:4) and recrystalization from dichloromethane-hexane afforded 2.1 g yellow crystals, mp 213°-215° C. treated in similar fashion to Example 67 Chromatography on silica gel with dichloromethane-methanol (96:4) and recrystalization from dichloromethane-hexane

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

Procedure: 45.11 g (0.127 mol) Methyl 3,3-dibenzylthio-2-cyanoacrylate and 13.35 g (0.127 mol) 4-methylthiosemicarbazide in 225 ml ethanol were heated under reflux for 10 hours. After cooling, the product was suction filtered, washed with ether and dried. under reflux for 10 hours After cooling filtered washed with ether dried

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

Procedure: A well-stirred mixture of 125 g (0.8 mole) of 3-chlorobenzoic acid and 84 g (0.8 mole) of 4-methylthiosemicarbazide in 700 ml of dioxane was heated until the solution was homogeneous. Phosphorus oxychloride (123 g, 0.8 mole) was added dropwise to the resulting solution at a rate to maintain the dioxane at gentle reflux. was heated until the solution