Diisopropyl Ether → HCID 86745629, 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), 1-butyryl-4-piperidinecarboxylic acid (6 g) and 1,8-diazabicyclo[5.4.0]undec-7-ene (4.6 g). The residue obtained is purified by chromatography on silica (0.063-0.2 mm; 250 g) contained in a column 4.2 cm in diameter [eluant: a mixture of methylene chloride and methanol (99:1 by volume)], collecting 70-cc fractions. Fractions 82 to 110 are combined and concentrated to dryness under reduced pressure (b 2.7 kPa). The solid obtained is taken up with stirring with isopropyl ether, then separated by filtration and dried. 2-(7-Chloro-1,8-naphthyridin-2-yl)-3-oxo-1-isoindolinyl 1-butyryl-4-piperidinecarboxylate (6 g), m.p. 165° C., is thereby obtained.

Provenance & Evidence