Regioselectivity in nucleophilic ring-opening of aziridinones
作者:Erach R. Talaty、Mashitah M. Yusoff
DOI:10.1039/a800564h
日期:——
The proportions of products derived from competing modes of ring-opening of 1,3-di-tert-butylaziridinone and similar aziridinones by a variety of nitrogen, oxygen, sulfur and halogen nucleophiles do not agree with simple guidelines postulated in the literature for these types of aziridinones.
Reaction of 1,3-di-tert-butylaziridinone and other di-tert-alkylaziridinones with cyanamides produces an imidazolidinone (3 or 6) bearing the tert-alkyl substituents at positions 1 and 5 only, by selective cleavage of the acyl-nitrogen bond. Treatment of the product from the unsubstituted cyanamide (3) with HNO2 furnishes the corresponding hydantoin (5), whereas treatment with alkyl halides and base affords another imidazolidinone (7).