甲基 (2S)-2-苯甲酰胺基-3-羟基丙酸乙酯

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

实验步骤: A stirred mixture of N-benzoyl-L-serine methyl ester (21.0 g), thionyl chloride (21.0 g), and methylene chloride (150 ml) is stirred at reflux for 1 hour. The solvent is evaporated and the residue is diluted with cold water. Neutralize with sodium bicarbonate, and extract with ethyl acetate. Purification on silica gel (250 g), eluting with methanol:methylene chloride (01:99), yields methyl (S)-2-phenyl-2-oxazoline-4-carboxylate (15.2 g). at reflux for 1 hour The solvent is evaporated the residue is diluted with cold water Neutralize with sodium bicarbonate, and extract with ethyl acetate Purification on silica gel (250 g) eluting with methanol:methylene chloride (01:99)

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

实验步骤: A solution of benzoyl chloride (17 g) in ethyl acetate (40 ml) is added dropwise, with stirring, in an ice-cold mixture of L-serine methyl ester, hydrochloride (15.5 g), water (100 ml), sodium bicarbonate (21.8 g), and ethyl acetate (100 ml). After stirring for 2 hours, the organic phase is separated, dried over sodium sulfate, and evaporated to give crystalline N-benzoyl-L-serine methyl ester (22.0 g). the organic phase is separated dried over sodium sulfate evaporated

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

实验步骤: A solution of benzoyl chloride (17 g) in ethyl acetate (40 ml) is added dropwise, with stirring, in an ice-cold mixture of L-serine methyl ester, hydrochloride (15.5 g), water (100 ml), sodium bicarbonate (21.8 g), and ethyl acetate (100 ml). After stirring for 2 hours, the organic phase is separated, dried over sodium sulfate, and evaporated to give crystalline N-benzoyl-L-serine methyl ester (22.0 g). the organic phase is separated dried over sodium sulfate evaporated

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

实验步骤: A stirred mixture of N-benzoyl-L-serine methyl ester (21.0 g), thionyl chloride (21.0 g), and methylene chloride (150 ml) is stirred at reflux for 1 hour. The solvent is evaporated and the residue is diluted with cold water. Neutralize with sodium bicarbonate, and extract with ethyl acetate. Purification on silica gel (250 g), eluting with methanol:methylene chloride (01:99), yields methyl (S)-2-phenyl-2-oxazoline-4-carboxylate (15.2 g). at reflux for 1 hour The solvent is evaporated the residue is diluted with cold water Neutralize with sodium bicarbonate, and extract with ethyl acetate Purification on silica gel (250 g) eluting with methanol:methylene chloride (01:99)

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

实验步骤: A solution of benzoyl chloride (17 g) in ethyl acetate (40 ml) is added dropwise, with stirring, in an ice-cold mixture of L-serine methyl ester, hydrochloride (15.5 g), water (100 ml), sodium bicarbonate (21.8 g), and ethyl acetate (100 ml). After stirring for 2 hours, the organic phase is separated, dried over sodium sulfate, and evaporated to give crystalline N-benzoyl-L-serine methyl ester (22.0 g). the organic phase is separated dried over sodium sulfate evaporated

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

实验步骤: A stirred mixture of N-benzoyl-L-serine methyl ester (21.0 g), thionyl chloride (21.0 g), and methylene chloride (150 ml) is stirred at reflux for 1 hour. The solvent is evaporated and the residue is diluted with cold water. Neutralize with sodium bicarbonate, and extract with ethyl acetate. Purification on silica gel (250 g), eluting with methanol:methylene chloride (01:99), yields methyl (S)-2-phenyl-2-oxazoline-4-carboxylate (15.2 g). at reflux for 1 hour The solvent is evaporated the residue is diluted with cold water Neutralize with sodium bicarbonate, and extract with ethyl acetate Purification on silica gel (250 g) eluting with methanol:methylene chloride (01:99)

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

实验步骤: A solution of benzoyl chloride (17 g) in ethyl acetate (40 ml) is added dropwise, with stirring, in an ice-cold mixture of L-serine methyl ester, hydrochloride (15.5 g), water (100 ml), sodium bicarbonate (21.8 g), and ethyl acetate (100 ml). After stirring for 2 hours, the organic phase is separated, dried over sodium sulfate, and evaporated to give crystalline N-benzoyl-L-serine methyl ester (22.0 g). the organic phase is separated dried over sodium sulfate evaporated

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

实验步骤: A stirred mixture of N-benzoyl-L-serine methyl ester (21.0 g), thionyl chloride (21.0 g), and methylene chloride (150 ml) is stirred at reflux for 1 hour. The solvent is evaporated and the residue is diluted with cold water. Neutralize with sodium bicarbonate, and extract with ethyl acetate. Purification on silica gel (250 g), eluting with methanol:methylene chloride (01:99), yields methyl (S)-2-phenyl-2-oxazoline-4-carboxylate (15.2 g). at reflux for 1 hour The solvent is evaporated the residue is diluted with cold water Neutralize with sodium bicarbonate, and extract with ethyl acetate Purification on silica gel (250 g) eluting with methanol:methylene chloride (01:99)

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

实验步骤: A solution of benzoyl chloride (17 g) in ethyl acetate (40 ml) is added dropwise, with stirring, in an ice-cold mixture of L-serine methyl ester, hydrochloride (15.5 g), water (100 ml), sodium bicarbonate (21.8 g), and ethyl acetate (100 ml). After stirring for 2 hours, the organic phase is separated, dried over sodium sulfate, and evaporated to give crystalline N-benzoyl-L-serine methyl ester (22.0 g). the organic phase is separated dried over sodium sulfate evaporated

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

实验步骤: A stirred mixture of N-benzoyl-L-serine methyl ester (21.0 g), thionyl chloride (21.0 g), and methylene chloride (150 ml) is stirred at reflux for 1 hour. The solvent is evaporated and the residue is diluted with cold water. Neutralize with sodium bicarbonate, and extract with ethyl acetate. Purification on silica gel (250 g), eluting with methanol:methylene chloride (01:99), yields methyl (S)-2-phenyl-2-oxazoline-4-carboxylate (15.2 g). at reflux for 1 hour The solvent is evaporated the residue is diluted with cold water Neutralize with sodium bicarbonate, and extract with ethyl acetate Purification on silica gel (250 g) eluting with methanol:methylene chloride (01:99)

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

实验步骤: A solution of benzoyl chloride (17 g) in ethyl acetate (40 ml) is added dropwise, with stirring, in an ice-cold mixture of L-serine methyl ester, hydrochloride (15.5 g), water (100 ml), sodium bicarbonate (21.8 g), and ethyl acetate (100 ml). After stirring for 2 hours, the organic phase is separated, dried over sodium sulfate, and evaporated to give crystalline N-benzoyl-L-serine methyl ester (22.0 g). the organic phase is separated dried over sodium sulfate evaporated