乙内酰脲杂质6

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A further aspect of the present invention is directed to a process for the preparation of salts of 2-hydroxy-4-(methylthio)-butanoic acid from 2-hydroxy-4-(methylthio)-butanenitrile. 2-Hydroxy-4-(methylthio)-butanenitrile is enzymatically hydrated to form 2-hydroxy-4-(methylthio)-butaneamide, and the resulting 2-hydroxy-4-(methylthio)-butaneamide is hydrolyzed in a basic solution to form a salt of 2-hydroxy-4-(methylthio)-butanoic acid.

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A process as set forth in claim 1 wherein 2-hydroxy-4-methylthiobutanenitrile is hydrolyzed in the presence of sulfuric acid to produce an intermediate hydrolyzate comprising 2-hydroxy-4-(methylthio)butanamide; and

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A further aspect of the present invention is directed to a process for the preparation of salts of 2-hydroxy-4-(methylthio)-butanoic acid from 2-hydroxy-4-(methylthio)-butanenitrile. 2-Hydroxy-4-(methylthio)-butanenitrile is enzymatically hydrated to form 2-hydroxy-4-(methylthio)-butaneamide, and the resulting 2-hydroxy-4-(methylthio)-butaneamide is hydrolyzed in a basic solution to form a salt of 2-hydroxy-4-(methylthio)-butanoic acid.

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A further aspect of the present invention is directed to a process for the preparation of salts of 2-hydroxy-4-(methylthio)-butanoic acid from 2-hydroxy-4-(methylthio)-butanenitrile. 2-Hydroxy-4-(methylthio)-butanenitrile is enzymatically hydrated to form 2-hydroxy-4-(methylthio)-butaneamide, and the resulting 2-hydroxy-4-(methylthio)-butaneamide is hydrolyzed in a basic solution to form a salt of 2-hydroxy-4-(methylthio)-butanoic acid.

反应条件: temp:110.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: In a 100 mL three-neck flask, 13.1 g of 96% strength 1-hydroxy-3-(methylthio)propanecarbonitrile (11) (0.1 mol) and 7.0 g of acetone (0.12 mol) were dissolved in 30 mL of glacial acetic acid at 10° C. Then, 5 mL of acetic anhydride (0.05 mol) were slowly added dropwise. Subsequently, a mixture of 10 mL of conc. sulfuric acid and 10 mL of glacial acetic acid was added slowly at 0° C. During this it must be ensured that the entire reaction solution does not become warmer than 0° C. This produced a viscous, yellowish, scarcely stirrable suspension. After addition was complete, the mixture was stirred for 1 h at 110° C. and subsequently 15 min at RT. The reaction solution was poured onto ice (approximately 150 g) and thereafter extracted three times with 100 mL of diethyl ether each time. The ether phase was washed once with saturated sodium hydrogencarbonate solution and subsequently with saturated sodium chloride solution and dried over sodium sulfate. The Na2SO4 was filtered off and the ether was taken off in vacuum. This produced 4.5 g of an orange-brown oil which was recrystallized from n-hexane. After filtration and removal of final solvent residues in high vacuum, 2.8 g (14.8 mmol, M=189.28 g/mol, yield=15%) of 2,2-dimethyl-5-(2-(methylthio)ethyl)-4-oxazolidinone (10) were isolated as a slightly yellowish solid. The NMR data agreed with those of Example 10. was added slowly at 0° C does not become warmer than 0° C This produced a viscous, yellowish, scarcely stirrable suspension After addition The reaction solution was poured onto ice (approximately 150 g) extracted three times with 100 mL of diethyl ether each time The ether phase was washed once with saturated sodium hydrogencarbonate solution and subsequently with saturated sodium chloride solution dried over sodium sulfate The Na2SO4 was filtered off This produced 4.5 g of an orange-brown oil which was recrystallized from n-hexane After filtration and removal of final solvent residues in high vacuum

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A process as set forth in claim 1 wherein 2-hydroxy-4-(methylthio)butanenitrile is hydrolyzed in the presence of sulfuric acid to produce an intermediate hydrolyzate comprising 2-hydroxy-4-(methylthio) butanamide; and

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A process as set forth in claim 1 wherein 2-hydroxy-4-methylthiobutanenitrile is hydrolyzed in the presence of sulfuric acid to produce an intermediate hydrolyzate comprising 2-hydroxy-4-(methylthio)butanamide; and

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A further aspect of the present invention is directed to a process for the preparation of salts of 2-hydroxy-4-(methylthio)-butanoic acid from 2-hydroxy-4-(methylthio)-butanenitrile. 2-Hydroxy-4-(methylthio)-butanenitrile is enzymatically hydrated to form 2-hydroxy-4-(methylthio)-butaneamide, and the resulting 2-hydroxy-4-(methylthio)-butaneamide is hydrolyzed in a basic solution to form a salt of 2-hydroxy-4-(methylthio)-butanoic acid.