(2S)-2-(dimethylamino)-3-methylbutanoic acid

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

Procedure: To a solution of N,N-dimethyl-L-valine (58 mg) and diphenylmethyl (S)-3-[(2S,3R,4R,5S)-2,3,4,6-tetrahydroxy-5-(L-leucyl)aminohexanoyl]amino-3-phenylpropionate (250 mg) in dimethylformamide (4 ml) were added diethyl cyanophosophonate (82 mg) and triethylamine (0.14 ml) and the mixture was stirred at room temperature for 18 hours. After addition of water, the whole was extracted with ethyl acetate and the extract was washed with saturated brine, followed by drying over anhydrous sodium sulfate. Removal of the organic solvent gave a residue, which was recrystallized from ehtyl acetate-hexane to afford the title compound (282 mg). the whole was extracted with ethyl acetate the extract was washed with saturated brine by drying over anhydrous sodium sulfate Removal of the organic solvent gave a residue, which was recrystallized from ehtyl acetate-hexane

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

Procedure: To a solution of N,N-dimethyl-L-valine (58 mg) and diphenylmethyl (S)-3-[(2S,3R,4R,5S)-2,3,4,6-tetrahydroxy-5-(L-leucyl)aminohexanoyl]amino-3-phenylpropionate (250 mg) in dimethylformamide (4 ml) were added diethyl cyanophosophonate (82 mg) and triethylamine (0.14 ml) and the mixture was stirred at room temperature for 18 hours. After addition of water, the whole was extracted with ethyl acetate and the extract was washed with saturated brine, followed by drying over anhydrous sodium sulfate. Removal of the organic solvent gave a residue, which was recrystallized from ehtyl acetate-hexane to afford the title compound (282 mg). the whole was extracted with ethyl acetate the extract was washed with saturated brine by drying over anhydrous sodium sulfate Removal of the organic solvent gave a residue, which was recrystallized from ehtyl acetate-hexane