反应详情

The procedure is as in Example 7, but starting with 2-(7-methoxy-1,8-naphthyridin-2-yl)-3-hydroxy-1-isoindolinone (6.8 g) in methylene chloride (100 cc), triethylamine (10.1 g), 5-methylhexanoyl chloride (6.4 g) and 4-dimethylaminopyridine (50 mg). The residue obtained after treatment is purified by chromatography on silica gel (0.063-0.2 mm; 100 g) contained in a column 2.8 cm in diameter (eluant: methylene chloride), collecting 30-cc fractions. Fractions 19 to 94 are combined and concentrated to dryness under reduced pressure (2.7 kPa). After the residue obtained has been recrystallized in heptane (75 cc), 2-(7-methoxy-1,8-naphthyridin-2-yl)-3-oxo-1-isoindolinyl 5-methylhexanoate (5.6 g), m.p. 105° C., is obtained.

1. customThe residue obtained after treatment
2. customis purified by chromatography on silica gel (0.063-0.2 mm; 100 g)
3. customcollecting 30-cc fractions
4. concentrationconcentrated to dryness under reduced pressure (2.7 kPa)
5. customAfter the residue obtained
6. customhas been recrystallized in heptane (75 cc)