1,8-Diazabicyclo(5.4.0)undec-7-ene → HCID 86745628, compound

Participants

Reaction Steps

The procedure is as in Example 1, but starting with 3-chloro-2-(7-chloro-1,8-naphthyridin-2-yl)-1-isoindolinone (9.9 g) in anhydrous dimethylformamide (100 cc), 4-isobutyrylaminobutyric acid (5.2 g) and 1,8-diazabicyclo[5.4.0]undec-7-ene (4.6 g). The residue obtained is recrystallized in acetonitrile and then purified by chromatography on silica (0.063-0.2 mm; 130 g) contained in a column 3 cm in diameter [eluant: methylene chloride/methanol (98:2 by volume) mixture] collecting 25-cc fractions. Fractions 79 to 85 are combined and concentrated to dryness under reduced pressure (2.7 kPa). The residue obtained is crystallized by stirring in isopropyl ether. 2-(7-chloro-1,8-naphthyridin-2-yl)-3-oxo-1-isoindolinyl 4-isobutyrylaminobutyrate (5.5 g), m.p. 208° C., is thereby obtained.

Provenance & Evidence