3-Methyl-D-threonine

white powder

4-fluoro-2-(trifluoromethyl)benzonitrile (7.10 g, 37.55 mmol) was mixed together with (R)-2-amino-3-hydroxy-3-methylbutanoic acid (5 g, 37.55 mmol) in DMSO (220 mL). K2CO3 (15.57 g, 112.65 mmol) was added to the reaction mixture and the reaction mixture stirred at 85 C. for 96 h. The reaction mixture was allowed to cool to room temperature and quenched with H2O (40 mL) and extracted with EtOAc (2×80 mL). The aqueous layer was then acidified with solid citric acid and extracted with EtOAc (2×80 mL). The later organic extracts were combined, washed with H2O (2×30 mL), dried (Na2SO4), filtered and concentrated under reduced pressure to provided the title compound as a pale yellow solid (11.1 g, 98%): 1H NMR (400 MHz, d6-acetone, delta in ppm) 7.57 (d, J=9 Hz, 1H), 6.98 (d, J=2 Hz, 1H), 6.80 (dd, J=9 and 2 Hz, 1H), 5.52 (br s, 1H), 3.96 (d, J=7 Hz, 1H), 1.42 (s, 3H), and 1.36 (s, 3H).4-fluoro-3-methyl-2-(trifluoromethyl)benzonitrile (763 mg, 3.76 mmol) was mixed together with (R)-2-amino-3-hydroxy-3-methylbutanoic acid (500 mg, 3.76 mmol) in DMSO (25 mL). K2CO3 (1.56 g, 11.28 mmol) was added to the reaction mixture and the reaction mixture stirred at 85 C. for 18 h. The reaction mixture was allowed to cool to room temperature, quenched with H2O (25 mL) and extracted with EtOAc (2×30 mL). The aqueous layer was then acidified with solid citric acid and extracted with EtOAc (2×80 mL). The later organic extracts were combined, washed with H2O (2×30 mL), dried (Na2SO4), filtered and concentrated under reduced pressure to provided the title compound as a yellow solid (1.15 g, 97%): 1H NMR (400 MHz, d6-acetone, delta in ppm) 7.63 (d, J=9 Hz, 1H), 6.97 (d, J=9 Hz, 1H), 5.62 (d, J=9 Hz, 1H), 4.20 (d, J=9 Hz, 1H), 2.33 (s, 3H), 1.43 (s, 3H) and 1.42 (s, 3H).

Molecular Weight:133.15
XLogP3:-2.8
Hydrogen Bond Donor Count:3
Hydrogen Bond Acceptor Count:4
Rotatable Bond Count:2
Exact Mass:133.07389321
Monoisotopic Mass:133.07389321
Topological Polar Surface Area:83.6
Heavy Atom Count:9
Complexity:121
Defined Atom Stereocenter Count:1
Covalently-Bonded Unit Count:1
Compound Is Canonicalized:Yes