反应详情

Dissolve the diastereomeric mixture of amines from the previous reaction which contains (2R,3S,5R)-5-[(1S,2S)-2-amino-3-(2-ethylphenyl)-1-hydroxypropyl]-2-(2,2-dimethylpropoxy)-3-methylmorpholine-4-carboxylic acid tert-butyl ester (418 mg, 0.9 mmol) in dry dichloromethane (7 mL) under a nitrogen atmosphere and add acetic anhydride (90 μL, 0.95 mmol) and triethylamine (150 μL, 1.1 mmol). After 4 hours quench with methanol, concentrate and purify (silica gel chromatography) to give a mixture of amide diastereomers containing the title compound (243 mg). Purify the resulting mixture by HPLC, eluting with 65:35 acetonitrile:water with 8 μM hydrochloric acid, to give the title compound as a single diastereomer (47 mg, 10% overall).

1. dissolutionDissolve
2. customfrom the previous reaction which
3. customAfter 4 hours quench with methanol
4. concentrationconcentrate
5. custompurify (silica gel chromatography)
6. customto give