Water → 1,9b-dihydro-3-isopropyl-3-methyl-5H-imidazo[2,1-a]isoindole2(3H),5-dione

Participants

Reaction Steps

A solution of 1.2 g 3-isopropyl-3-methyl-5H-imidazo[2,1-a]isoindole-2(3H),5-dione in 75 ml acetic acid and 10 ml water containing 100 mg 5% palladium on carbon is shaken in an atmosphere of hydrogen at a pressure of 10 psi and room temperature. One equivalent of hydrogen is absorbed in 75 minutes. The mixture is filtered, and the filtrate concentrated under reduced pressure. To the residue is added toluene which is then removed in vacuo. This is repeated. To the gummy residue is added a small volume of acetonitrile to give the desired 1,9b-dihydro-3-isopropyl-3-methyl-5H-imidazo[2,1-a]isoindole-2(3H),5-dione as a crystalline solid identical to that prepared in Example 1.

Provenance & Evidence