反应详情

A solution of 2-[2-hydroxy-3-[3-(1-piperidinylmethyl)phenoxy]propyl]-1H-isoindole-1,3-(2H) dione (17.6 g) and hydrazine hydrate (2.5 g) in ethanol (60 ml) was heated under reflux for 3 h. The resulting mixture was evaporated to a solid residue which was suspended in 1N hydrochloric acid (30 ml) and filtered. The filtrate was basified with an excess of potassium carbonate and extracted with isopropanol (3×40 ml). The isopropanol extracts were dried (Na2CO3) and evaporated to a gum which was chromatographed using System A. Crystallisation of the product from n-hexane:ether (20:1) gave the title compound as colourless grains (7.7 g), m.p. 74°-76.5°.

1. temperatureunder reflux for 3 h
2. customThe resulting mixture was evaporated to a solid residue which
3. filtrationfiltered
4. extractionextracted with isopropanol (3×40 ml)
5. dry with materialThe isopropanol extracts were dried (Na2CO3)
6. customevaporated to a gum which
7. customwas chromatographed
8. customCrystallisation of the product from n-hexane:ether (20:1)