3-methylbutanimidamide;hydrochloride

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

Procedure: A stirred mixture of 2-amino-4-phenylthiophene-3-carboxylic acid ethyl ester (350.43 g, 1.54 mol), isopropylacetamidine hydrochloride (958.75 g, 7.7 mol) and ethanol (1500 ml) was heated under reflux for 18 hours then allowed to cool to ambient temperature. The resulting solid was collected by filtration, washed with a little cold ethanol, then crystallised from ethanol to give 2-Isopropyl-5-phenyl-3H-thieno[2,3-d]pyrimidin-4-one as a yellow solid which was used without further purification. was heated under reflux for 18 hours The resulting solid was collected by filtration washed with a little cold ethanol crystallised from ethanol

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

Procedure: Sodium (0.75 g, 32.94 mmol) and ethanol (20 mL) were introduced in a flask. Once all the sodium had dissolved, 3-methylbutanimidamide hydrochloride (1.5 g, 10.98 mmol) and diethyl malonate (1.67 mL, 10.98 mmol) were added. It was stirred for 1 hour at room temperature and for 5 hours under reflux. The reaction crude was cooled at room temperature and concentrated to dryness. The solid obtained was dissolved in water and the pH was adjusted to 5 with acetic acid. The precipitate formed was filtered providing 1.5 g of the title compound (yield: 81%). under reflux The reaction crude was cooled at room temperature concentrated to dryness The solid obtained The precipitate formed was filtered

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

Procedure: 78.8 parts of methyl chloroformate and a mixture of 46.8 parts of potassium hydroxide in 215 parts of water are added via two inlets to a mixture of 113.8 parts of isovaleramidine hydrochloride in 530 parts of methylene chloride, at from 0° to 10° C., in the course of 25 minutes, while stirring. The mixture is stirred at 25° C. for 30 minutes, the phases are separated and the aqueous phase is extracted once with methylene chloride. The solvent is removed from the organic extract to give 123 parts (93.3% of theory) of N-methoxycarbonylisovaleramidine of melting point 82°-86° C. The mixture is stirred at 25° C. for 30 minutes the phases are separated the aqueous phase is extracted once with methylene chloride The solvent is removed from the organic extract

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

Procedure: A stirred mixture of 2-amino-4-phenylthiophene-3-carboxylic acid ethyl ester (350.43 g, 1.54 mol), isopropylacetamidine hydrochloride (958.75 g, 7.7 mol) and ethanol (1500 ml) was heated under reflux for 18 hours then allowed to cool to ambient temperature. The resulting solid was collected by filtration, washed with a little cold ethanol, then crystallised from ethanol to give 2-Isopropyl-5-phenyl-3H-thieno[2,3-d]pyrimidin-4-one as a yellow solid which was used without further purification. was heated under reflux for 18 hours The resulting solid was collected by filtration washed with a little cold ethanol crystallised from ethanol