Ring-expansion of an aziridinone to a hexahydrotriazine through the agency of a novel rearrangement
摘要:
Reaction of 1,3-di-tert-butylaziridinone (1a) and similar aziridinones with thiosemicarbazide affords, as one of the products, a compound devoid of sulfur, viz., a substituted N-aminoimidazolidinone (3a) by selective cleavage of the acyl-nitrogen bond. Compound 3a undergoes a novel, acid-catalyzed rearrangement to a 3-imino-hexahydro-1,2,4-triazin-6-one (7a), which can also be obtained by treatment of 1a with hydrazine followed by BrCN, involving again selective cleavage of the acyl-nitrogen bond. Copyright (C) 1996 Elsevier Science Ltd
A direct link between the Passerini reaction and α-lactams
作者:István Lengyel、Victor Cesare、Tony Taldone
DOI:10.1016/j.tet.2003.11.067
日期:2004.1
α-Lactams (aziridinones) can function to replace two of the three reactants, the oxo-compound and the isonitrile, in the Passerini reaction. Four α-lactams (5a-d) were reacted with mono- and dicarboxylic acids of positive pKa values to give 2-acyloxycarboxamides (4) and bis-2-acyloxycarboxamide products 12 and 13, respectively. The same compounds were also prepared via the Passerini reaction. Acids
α-内酰胺(叠氮ino烷)可以在Passerini反应中取代三种反应物中的两种,即氧代化合物和异腈。使四个α-内酰胺(5a - d)与正p K a值的单羧酸和二羧酸反应,分别得到2-酰氧基羧酰胺(4)和双-2-酰氧基羧酰胺产物12和13。还通过Passerini反应制备了相同的化合物。p K a p为负的酸将α-内酰胺脱羰,生成铵盐。反应的主要路径取决于p K a 酸成分,α-内酰胺的反应性和反应条件。
About the Factors Which Govern the Ring-Opening of a-Lactams with Primary Amines: II. The Relative Basicity of the Amine
作者:Victor Cesare、Tony Taldone、István Lengyel
DOI:10.3987/com-02-9585
日期:——
3-tert-butyl-1-triphenylmethylaziridinone (1e), and 1-(1-adamantyl)-3-tert-butylaziridinone (1g) with some substituted benzylamines and other selected primary amines is described. It emerges from the experimental results that the relativebasicity of the amine is a decisive factor in determining regioselectivity in the ring-opening.
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).