反应详情

According to the method of Preparation 3, tert-butyl (2S, 3R)-3-({[(1S)-2,2-dimethyl-1-({[(1R)-1-phenylethyl]amino}carbonyl)propyl]amino}carbonyl)-2-(1-propyl)hex-5-enoate (543 mg, 1.15 mmol) was reacted with 3-methyl-4-phenylbromobenzene (356 mg, 1.44 mmol) under palladium catalysis in a mixture of anhydrous acetonitrile and dimethylformamide (2:5, 7 mL) at 90° C. for 17 h. The mixture was concentrated under reduced pressure, poured into ethyl acetate (100 mL) and washed with water (2×100 mL), dried (MgSO4), and concentrated under reduced pressure. The residue was purified by flash chromatography (gradient elution with hexane:ethyl acetate) to give mainly tert-butyl (2S,3R,5E)-3-({[(1S)-2,2-dimethyl-1-({[(1R)-1-phenylethyl]amino}carbonyl)propyl]amino}carbonyl)-6-[3-methyl-(4-phenyl)phenyl]-2-(1-propyl)hex-5-enoate as a colourless gum (460 mg, 63%). 1H nmr suggested that two alkene isomers, the (5Z) and (4E) were also present. The mixture of alkenes was taken onto the next step (see c, below).

1. concentrationThe mixture was concentrated under reduced pressure
2. additionpoured into ethyl acetate (100 mL)
3. washwashed with water (2×100 mL)
4. dry with materialdried (MgSO4)
5. concentrationconcentrated under reduced pressure
6. customThe residue was purified by flash chromatography (gradient elution with hexane:ethyl acetate)