(1S,2S)-[3-Chloro-1-(3,5-difluoro-benzyl)-2-hydroxy-propyl]-carbamic acid tert-butyl ester → (2S,3S)-3-amino-1-chloro-4-(3,5-difluorophenyl)butan-2-ol

Participants

Reaction Steps

tert-butyl (1S,2S)-3-chloro-1-(3,5-difluorobenzyl)-2-hydroxypropylcarbamate (IV, EXAMPLE 3, 1.0 gm, 2.98 mmol) and Dowex50WX2-400 resin (4.6 gm 23.8 mmol) and methanol (25 mL) are mixed. The mixture is then placed over a J-Kim shaker with heating at 50° for 2 hr. ESMS analysis indicates no starting material left in the mixture. The reaction contents are filtered through a sintered funnel and the resin washed with methanol (25 mL) and methanol/methylene chloride (1/1, 25 mL). The resulting mixture is eluted with ammonia in methanol (2N, 2×25 mL). The eluate is concentrated under reduced pressure to give the title compound, ESMS=236.1.

Provenance & Evidence