p-Toluenesulfonic acid → 3-isopropyl-3-methyl-3H-imidazo[2,1-a]isoindole-2,5-dione

Beteiligte Stoffe

Reaktionsschritte

The above procedure is repeated in all respects, excepting that the strong base reagent is altered, In separate experiments, sodium hydride, potassium hydroxide, barium oxide, diisopropylethylamine, 1,5-diazobicylo[5.4.0]undicene5, tetramethylguanidine, tetramethylbenzyl ammonium hydroxide, Amberlite A21 (Rohm & Haas) strongly basic ion exchange resin or p-toluene sulfonic acid, are substituted for sodium hydroxide and yield the desired 3-isopropyl-3-methyl-5H-imidazo[2,1-a]isoindole-2(3H),5-dione. In practice of the above-described method, sodium hydroxide or sodium hydride in refluxing toluene is preferred.

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