1-Bromo-2-methylpropane → (2R,3S,5R)-5-[(1S,2S)-2-Acetylamino-3-(3-fluoro-5-isobutoxy-phenyl)-1-hydroxypropyl]-2-(2,2-dimethyl-propoxy)-3-methyl-morpholine-4-carboxylic acid tert-butyl ester

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

Add 1-bromo-2-methyl-propane (0.05 g, 0.35 mmol) to (2R,3S,5R)-5-[(1S,2S)-2-acetylamino-3-(3-fluoro-5-hydroxy-phenyl)-1-hydroxy-propyl]-2-(2,2-dimethyl-propoxy)-3-methyl-morpholine-4-carboxylic acid tert-butyl ester (0.12 g, 0.23 mmol) and cesium carbonate (0.15 g, 0.46 mmol) in N,N-dimethylformamide (3 mL) under nitrogen and heat in a 60° C. oil bath for 2.5 hours. Cool to room temperature and dilute with ethyl acetate. Wash (0.1N citric acid, 10% potassium carbonate, saturated aqueous sodium chloride), dry (magnesium sulfate), filter and concentrate. Purify on 12 g silica gel column eluting with 100:0 to 40:60 hexanes:ethyl acetate to give 0.072 g (54.5%) of the title compound as a white foam.

Herkunft & Nachweise